U.S. patent application number 16/614217 was filed with the patent office on 2021-02-04 for novel transition metal compound and method for preparing the same.
This patent application is currently assigned to LG Chem, Ltd.. The applicant listed for this patent is LG Chem, Ltd.. Invention is credited to Yoon Hee Cho, Young Shil Do, Jin Sam Gong, Hyo Jung Han, Seung Hwan Jung, Choong Hoon Lee, Eun Jung Lee.
Application Number | 20210032274 16/614217 |
Document ID | / |
Family ID | 1000005193446 |
Filed Date | 2021-02-04 |
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United States Patent
Application |
20210032274 |
Kind Code |
A1 |
Do; Young Shil ; et
al. |
February 4, 2021 |
Novel Transition Metal Compound and Method for Preparing the
Same
Abstract
A transition metal compound represented by Chemical Formula I
and a method for preparing the same, catalyst compositions
including the same, and olefin-based polymers prepared from the
same are disclosed herein. The transition metal catalyst has
excellent structural stability together with excellent catalytic
activity and can exhibit excellent copolymerizability even at a
high temperature. In an embodiment, an olefin-based polymer
prepared using a catalyst composition including the transition
metal compound has a density of 0.91 g/cc or less.
Inventors: |
Do; Young Shil; (Daejeon,
KR) ; Gong; Jin Sam; (Daejeon, KR) ; Lee; Eun
Jung; (Daejeon, KR) ; Lee; Choong Hoon;
(Daejeon, KR) ; Jung; Seung Hwan; (Daejeon,
KR) ; Cho; Yoon Hee; (Daejeon, KR) ; Han; Hyo
Jung; (Daejeon, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG Chem, Ltd. |
Seoul |
|
KR |
|
|
Assignee: |
LG Chem, Ltd.
Seoul
KR
|
Family ID: |
1000005193446 |
Appl. No.: |
16/614217 |
Filed: |
July 27, 2018 |
PCT Filed: |
July 27, 2018 |
PCT NO: |
PCT/KR2018/008561 |
371 Date: |
November 15, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C08F 10/02 20130101;
C07F 7/28 20130101 |
International
Class: |
C07F 7/28 20060101
C07F007/28; C08F 10/02 20060101 C08F010/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 27, 2017 |
KR |
10-2017-0095360 |
Jul 27, 2017 |
KR |
10-2017-0095361 |
Jul 26, 2018 |
KR |
10-2018-0087437 |
Claims
1. A transition metal compound represented by the following
Chemical Formula 1: ##STR00035## wherein, in Chemical Formula 1, A
is carbon, silicon, or germanium; Y is oxygen or sulfur; M is a
Group 4 transition metal; X.sup.1 and X.sup.2 are the same as or
different from each other, and are each independently a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C6 to C20 aryl group, a nitro group, an amido group,
a substituted or unsubstituted C1 to C20 alkylamino group, a
substituted or unsubstituted C6 to C20 arylamino group, a
substituted or unsubstituted C1 to C20 alkylsilyl group, a
substituted or unsubstituted C1 to C20 alkoxy group, or a
substituted or unsubstituted C1 to C20 sulfonate group; R.sup.1 is
a substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C1 to C20 alkoxy group, a substituted
unsubstituted C2 to C20 alkenyl group, a substituted unsubstituted
C6 to C20 aryl group, a substituted or unsubstituted C7 to C20
alkylaryl group, or a substituted or unsubstituted C7 to C20
arylalkyl group; R.sup.2 and R.sup.3 are the same as or different
from each other, and are each independently hydrogen, a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C2 to C20 alkoxyalkyl group, a substituted or
unsubstituted C6 to C20 aryl group, a substituted or unsubstituted
C7 to C20 alkylaryl group, or a substituted or unsubstituted C7 to
C20 arylalkyl group, or R.sup.2 and R.sup.3 are linked to each
other to form a substituted or unsubstituted aliphatic or aromatic
ring; and R.sup.4 to R.sup.6 are the same as or different from each
other, and are each independently hydrogen, a substituted or
unsubstituted C1 to C20 alkyl, a substituted or unsubstituted C2 to
C20 alkenyl, a substituted or unsubstituted C6 to C20 aryl group, a
substituted or unsubstituted C7 to C20 alkylaryl, or a substituted
or unsubstituted C7 to C20 arylalkyl.
2. The transition metal compound according to claim 1, wherein
R.sup.1 is an alkyl group having 1 to 8 carbon atoms, an alkoxy
group having 1 to 8 carbon atoms, or an aryl group having 6 to 12
carbon atoms.
3. The transition metal compound according to claim 1, wherein
R.sup.1 is a methyl group, an ethyl group, a propyl group, an
isopropyl group, an n-butyl group, a tert-butyl group, a pentyl
group, a hexyl group, a heptyl group, an octyl group, a phenyl
group, a methoxy group, or an ethoxy group.
4. The transition metal compound according to claim 1, wherein
R.sup.2 and R.sup.3 are each independently hydrogen, an alkyl group
having 1 to 8 carbon atoms, an alkoxyalkyl group having 2 to 8
carbon atoms, or an aryl group having 6 to 12 carbon atoms.
5. The transition metal compound according to claim 1, wherein
R.sup.2 and R.sup.3 are each independently hydrogen, a methyl
group, an ethyl group, a propyl group, an isopropyl group, an
n-butyl group, a tert-butyl group, a methoxymethyl group, a
tert-butoxymethyl group, a tert-butoxyhexyl group, a 1-ethoxyethyl
group, a 1-methyl-1-methoxyethyl group, or a phenyl group.
6. The transition metal compound according to claim 1, wherein
R.sup.4 to R.sup.6 are each independently hydrogen, an alkyl group
having 1 to 8 carbon atoms, or an aryl group having 6 to 12 carbon
atoms.
7. The transition metal compound according to claim 1, wherein
R.sup.4 to R.sup.6 are each independently hydrogen, a methyl group,
an ethyl group, a propyl group, or a phenyl group.
8. The transition metal compound according to claim 1, wherein the
compound represented by Chemical Formula 1 is represented by one of
the following structural formulae: ##STR00036##
9. A method for preparing a transition metal compound represented
by the following Chemical Formula 1, comprising: reacting a ligand
compound represented by the following Chemical Formula 2 with an
organolithium-based compound to form a reaction product; and then
reacting the reaction product with a compound represented by the
following Chemical Formula 3, and a Grignard compound or an
organolithium-based compound to form a transition metal compound:
##STR00037## wherein, in Chemical Formulae 1, 2, and 3, A is
carbon, silicon or germanium; Y is oxygen or sulfur; M is a Group 4
transition metal; X.sup.1 and X.sup.2 are the same as or different
from each other, and are each independently a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C6 to C20 aryl group, a nitro group, an amido group,
a substituted or unsubstituted C1 to C20 alkylamino group, a
substituted or unsubstituted C6 to C20 arylamino group, a
substituted or unsubstituted C1 to C20 alkylsilyl group, a
substituted or unsubstituted C1 to C20 alkoxy group, or a
substituted or unsubstituted C1 to C20 sulfonate group; R.sup.1 is
a substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C1 to C20 alkoxy group, a substituted or
unsubstituted C2 to C20 alkenyl group, a substituted unsubstituted
C6 to C20 aryl group, a substituted or unsubstituted C7 to C20
alkylaryl group, or a substituted or unsubstituted C7 to C20
arylalkyl group; R.sup.2 and R are the same as or different from
each other, and are each independently hydrogen, a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C2 to C20 alkoxyalkyl group, a substituted or
unsubstituted C6 to C20 aryl group, a substituted or unsubstituted
C7 to C20 alkylaryl group, or a substituted or unsubstituted C7 to
C20 arylalkyl group, or R.sup.2 and R.sup.3 are linked to each
other to form a substituted or unsubstituted aliphatic or aromatic
ring; and R.sup.4 to R.sup.6 are the same as or different from each
other, and are each independently hydrogen, a substituted or
unsubstituted C1 to C20 alkyl, a substituted or unsubstituted C2 to
C20 alkenyl, a substituted or unsubstituted C6 to C20 aryl group, a
substituted or unsubstituted C7 to C20 alkylaryl, or a substituted
or unsubstituted C7 to C20 arylalkyl.
10. The method for preparing a transition metal compound according
to claim 9, further comprising: reacting a compound of the
following Chemical Formula 4 with a compound of the following
Chemical Formula 5 to prepare the ligand compound of Chemical
Formula 2: ##STR00038## wherein, in Chemical Formulae 4 and 5, A,
Y, and R.sup.1 to R.sup.6 are as defined for Chemical Formulae 1
and 2, and Q.sup.2 is a halogen group.
11. The method for preparing a transition metal compound according
to claim 10, further comprising: reacting a compound of the
following Chemical Formula 6 with a compound of the following
Chemical Formula 7 in the presence of an organolithium-based
compound to prepare the compound of Chemical Formula 4:
##STR00039## wherein, in Chemical Formulae 6 and 7, A, Y, R.sup.1
to R.sup.3, and Q.sup.2 are as described in Chemical Formulae 4 and
5, and Q.sup.1 is a halogen group.
12. The method for preparing a transition metal compound according
to claim 9, wherein the organolithium-based compound is selected
from the group consisting of alkyl lithium, cycloalkyl lithium,
allyl lithium, vinyl lithium, aryl lithium, arylalkyl lithium, and
alkylaryl lithium.
13. The method for preparing a transition metal compound according
to claim 9, wherein the ligand compound represented by Chemical
Formula 2 and the organolithium-based compound are used in a molar
ratio of 1:1 to 1:3.
14. The method for preparing a transition metal compound according
to claim 9, wherein the reaction of the ligand compound represented
by Chemical Formula 2 and the organolithium-based compound is
carried out at -90.degree. C. to 10.degree. C.
15. The method for preparing a transition metal compound according
to claim 9, wherein the Grignard compound includes a compound
represented by the following Chemical Formula 13: R'MgX [Chemical
Formula 13] wherein, in Chemical Formula 13, R.sup.1 is selected
from the group consisting of a C1 to C20 alkyl group, a C3 to C20
cycloalkyl group, a C6 to C20 aryl group, a C7 to C20 alkylaryl
group, and a C7 to C20 arylalkyl group, and X is a halogen
group.
16. A catalyst composition comprising a transition metal compound
according to claim 1.
17. The catalyst composition according to claim 16, further
comprising: one or more selected from the group consisting of
compounds of the following Chemical Formulae 14 to 16:
A(R.sup.7).sub.3 [Chemical Formula 14]
[L-H].sup.+[W(D).sub.4].sup.- [Chemical Formula 15]
[L].sup.+[W(D).sub.4].sup.- [Chemical Formula 16] wherein, in
Chemical Formulae 14 to 16, each of R.sup.7 is independently
selected from the group consisting of a halogen group, a
hydrocarbyl group having 1 to 20 carbon atoms, and a hydrocarbyl
group having 1 to 20 carbon atoms substituted with a halogen group;
A is boron, each D is independently an aryl group having 6 to 20
carbon atoms or an alkyl group having 1 to 20 carbon atoms in which
one or more hydrogen atoms may be substituted with a substituent,
and herein, the substituent is at least any one selected from the
group consisting of a halogen, a hydrocarbyl group having 1 to 20
carbon atoms, an alkoxy group having 1 to 20 carbon atoms, and an
aryloxy group having 6 to 20 carbon atoms; H is a hydrogen atom; L
is a neutral or cationic Lewis acid; and W is a group 13
element.
18. An olefin-based polymer is prepared using a catalyst
composition according to claim 16, the olefin-based polymer having
a density of 0.91 g/cc or less.
19. The olefin-based polymer according to claim 18, wherein the
olefin-based polymer is an ethylene homopolymer, or a copolymer of
ethylene and .alpha.-olefin.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to and the benefits of
Korean Patent Application No. 10-2017-0095360, filed on Jul. 27,
2017, Korean Patent Application No. 10-2017-0095361, filed on Jul.
27, 2017, and Korean Patent Application No. 10-2018-0087437, filed
on Jul. 26, 2018, with the Korean Intellectual Property Office, the
disclosures of which are incorporated herein by reference in their
entirety.
TECHNICAL FIELD
[0002] The present invention relates to a novel transition metal
compound, a method for preparing the same, and a catalyst
composition including the transition metal compound.
BACKGROUND ART
[0003] In the existing commercial preparation process of
polyolefins, Ziegler-Natta catalysts such as titanium and vanadium
compounds have been widely used. However, although the
Ziegler-Natta catalyst has high activity, it is a multi-active-site
catalyst, and thus has a limit in securing desired physical
properties because the molecular weight distribution of the
produced polymer is wide and the compositional distribution of
comonomers is not uniform.
[0004] Thus, recently, metallocene catalysts wherein a transition
metal such as titanium, zirconium, hafnium, and the like, and a
ligand including a cyclopentadiene functional group are bonded were
developed and are being widely used. The metallocene compound is
generally activated with aluminoxane, borane, borate, or other
activators before use. For example, a metallocene compound having a
ligand including a cyclopentadienyl group and two sigma chloride
ligands uses aluminoxane as an activator. When the chloride group
of such a metallocene compound is substituted with another ligand
(e.g., a benzyl or trimethylsilylmethyl group
(--CH.sub.2SiMe.sub.3)), an example showing effects such as an
increase in catalytic activity has been reported.
[0005] Dow Chemical Company disclosed
[Me.sub.2Si(Me.sub.4C.sub.5)NtBu]TiCl.sub.2 (Constrained-Geometry
Catalyst, hereinafter `CGC`) in the early 1990's (U.S. Pat. No.
5,064,802, etc.), and the superior aspects of the GCC in
copolymerization reaction between ethylene and alpha-olefin
compared to metallocene catalysts that have been known in the art
can largely be summarized by two points as follows. (1) CGC
produces a high molecular weight polymer while exhibiting high
activity even at high polymerization temperatures, and (2) the
copolymerizability of alpha-olefin having large steric hindrance
such as 1-hexene and 1-octene is also excellent. In addition, as
various characteristics in the polymerization reaction of CGC have
been gradually known, efforts have been made to synthesize
derivatives of COO in the academic world and the industrial world
for use as a polymerization catalyst.
[0006] As one of the approaches, synthesis of a metal compound to
which various bridges and nitrogen substituents are introduced
instead of silicone bridges and polymerization using the same have
been attempted. Representative metal compounds known up to now
include phosphorus, ethylene or propylene, methylidene, and
methylene bridges respectively introduced thereto instead of a
silicone bridge of a CGC structure, but they did not show excellent
results in the aspects of polymerization activity or
copolymerization performance in comparison to COO when they were
applied to polymerization of ethylene or to copolymerization of
ethylene and alpha olefins.
[0007] As another approach, many compounds including oxido ligands
instead of amido ligands of the CGC have been synthesized, and some
polymerization attempts using the same have been tried.
[0008] However, very few catalysts have been being applied in
practice in commercial factories among the above attempts, and
there is still a demand for a catalyst exhibiting improved
polymerization performance.
DETAILS OF THE INVENTION
Objects of the Invention
[0009] One object of the present invention is to provide a novel
transition metal compound which exhibits excellent
copolymerizability at high temperatures, and thus is useful for the
preparation of an olefin-based polymer, especially a high molecular
weight and low density olefin-based polymer.
[0010] Another object of the present invention is to provide a
method for preparing a transition metal compound containing a novel
ligand compound having indeno-fused benzofuran or indeno-fused
benzothiophene structures having certain substituents.
[0011] Still another object of the present invention is to provide
a catalyst composition including the above-mentioned transition
metal compound.
[0012] A further object of the present invention is to provide an
olefin-based polymer prepared using the catalyst composition
including the transition metal compound.
Means for Achieving the Object
[0013] According to one embodiment of the present invention, a
transition metal compound represented by the following Chemical
Formula 1 is provided.
##STR00001##
[0014] In Chemical Formula 1,
[0015] A is carbon (C), silicon (Si), or germanium (Ge);
[0016] Y is oxygen (O) or sulfur (S);
[0017] M is a Group 4 transition metal;
[0018] X.sup.1 and X.sup.2 are the same as or different from each
other and are each independently a halogen, a substituted or
unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted
C2 to C20 alkenyl group, a substituted or unsubstituted C6 to C20
aryl group, a nitro group, an amido group, a substituted or
unsubstituted C1 to 020 alkylamino group, a substituted or
unsubstituted C6 to C20 arylamino group, a substituted or
unsubstituted C1 to C20 alkylsilyl group, a substituted or
unsubstituted to C20 alkoxy group, or a substituted or
unsubstituted C1 to C20 sulfonate group;
[0019] R.sup.1 is a substituted or unsubstituted C1 to C20 alkyl
group, a substituted or unsubstituted al to C20 alkoxy group, a
substituted or unsubstituted C2 to C20 alkenyl group, a substituted
or unsubstituted C6 to C20 aryl group, a substituted or
unsubstituted C7 to C20 alkylaryl group, or a substituted or
unsubstituted C7 to C20 arylalkyl group;
[0020] R.sup.2 and R.sup.3 are the same as or different from each
other, and are each independently hydrogen, a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C2 to C20 alkoxyalkyl group, a substituted or
unsubstituted C6 to C20 aryl group, a substituted or unsubstituted
C7 to C20 alkylaryl group, or a substituted or unsubstituted C7 to
C20 arylalkyl group, or R.sup.2 and R.sup.3 are linked to each
other to form a substituted or unsubstituted aliphatic or aromatic
ring; and
[0021] R.sup.4 to R.sup.6 are the same as or different from each
other, and are each independently hydrogen, a substituted or
unsubstituted C1 to C20 alkyl, a substituted or unsubstituted C2 to
C20 alkenyl, a substituted or unsubstituted C6 to C20 aryl group, a
substituted or unsubstituted C7 to C20 alkylaryl, or a substituted
or unsubstituted C7 to 020 arylalkyl.
[0022] According to another embodiment of the invention, a method
for preparing a transition metal compound represented by the
following Chemical Formula 1 is provided, including the steps of:
reacting a ligand compound represented by the following Chemical
Formula 2 with an organolithium-based compound; and then reacting
the resultant reaction product with a compound represented by the
following Chemical Formula 3, and a Grignard compound or an
organolithium-based compound.
##STR00002##
[0023] In Chemical Formulae 1, 2, and 3,
[0024] A is carbon (C), silicon (Si) or germanium (Ge);
[0025] Y is oxygen (O) or sulfur (5);
[0026] M is a Group 4 transition metal;
[0027] X.sup.1 and X.sup.2 are the same as or different from each
other and are each independently a halogen, a substituted or
unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted
C2 to C20 alkenyl group, a substituted or unsubstituted C6 to C20
aryl group, a nitro group, an amido group, a substituted or
unsubstituted C1 to C20 alkylamino group, a substituted or
unsubstituted C6 to C20 arylamino group, a substituted or
unsubstituted C1 to C20 alkylsilyl group, a substituted or
unsubstituted C1 to C20 alkoxy group, or a substituted or
unsubstituted C1 to C20 sulfonate group;
[0028] R.sup.1 is a substituted or unsubstituted C1 to C20 alkyl
group, a substituted or unsubstituted C1 to C20 alkoxy group, a
substituted or unsubstituted C2 to C20 alkenyl group, a substituted
or unsubstituted C6 to C20 aryl group, a substituted or
unsubstituted C7 to C20 alkylaryl group, or a substituted or
unsubstituted C7 to C20 arylalkyl group;
[0029] R.sup.2 and R.sup.3 are the same as or different from each
other, and are each independently hydrogen, a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C2 to C20 alkoxyalkyl group, a substituted or
unsubstituted C6 to C20 aryl group, a substituted or unsubstituted
C7 to C20 alkylaryl group, or a substituted or unsubstituted C7 to
C20 arylalkyl group, or R.sup.2 and R.sup.3 are linked to each
other to form a substituted or unsubstituted aliphatic or aromatic
ring; and
[0030] R.sup.4 to R.sup.6 are the same as or different from each
other, and are each independently hydrogen, a substituted or
unsubstituted C1 to C20 alkyl, a substituted or unsubstituted C2 to
C20 alkenyl, a substituted or unsubstituted C6 to C20 aryl group, a
substituted or unsubstituted C7 to C20 alkylaryl, or a substituted
or unsubstituted C7 to C20 arylalkyl.
[0031] According to another embodiment of the present invention, a
catalyst composition including the transition metal compound of
Chemical Formula 1 is provided.
[0032] According to another embodiment of the present invention, an
olefin-based polymer that is prepared using the aforementioned
catalyst composition and has a density of 0.91 g/cc or less is
provided.
Effects of the Invention
[0033] The transition metal compound according to the present
invention has excellent structural stability together with
excellent polymerization reactivity and can exhibit excellent
copolymerizability at a high temperature. As a result, the
transition metal compound is useful for the preparation of
olefin-based polymers, especially high molecular weight and low
density polyethylene.
[0034] In addition, the transition metal compound is particularly
useful for the preparation of copolymers of ethylene and alpha
olefins since approaches of monomers having large steric hindrance
are more structurally facilitated.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0035] Hereinafter, a novel transition metal compound according to
specific embodiments of the present invention, a method for
preparing the same, a catalyst composition including the same, and
an olefin-based poly r prepared using the same will be
described.
[0036] Prior to the description, the terminology used herein is for
the purpose of describing particular embodiments only and is not
intended to limit the scope of the invention.
[0037] Further, the singular forms "a", "an", and "the" are
intended to include plural referents, unless the context clearly
indicates otherwise.
[0038] In addition, the meaning of the terms "comprise" and
"include" as used herein is intended to specify the presence of
stated features, ranges, integers, steps, operations, elements,
and/or components, but does not preclude the presence or addition
of other features, ranges, integers, steps, operations, elements,
and/or components.
[0039] The terms "first", "second", etc. may be used herein to
describe various components, and these terms are used only for
distinguishing one element from others.
[0040] Further, terms used "herein" are used only to describe
particular embodiments, and are not intended to be limiting of the
invention.
[0041] As used herein, singular expressions are intended to include
plural expressions as well, unless the context clearly indicates
otherwise. It should be understood that the terms "comprise",
"include", "have", etc. are used herein to specify the presence of
stated features, numbers, steps, components, or combinations
thereof, but do not preclude the presence or addition of one or
more other features, numbers, steps, components, or combinations
thereof.
[0042] Since the embodiments of the present invention are
susceptible to various modifications and alternative forms,
specific embodiments thereof will be illustrated and described in
detail below.
[0043] It should be understood, however, that the present invention
is not limited to the particular embodiments disclosed, but on the
contrary, the invention is to cover all modifications, equivalents,
and alternatives falling within the spirit and scope of the
invention.
[0044] Hereinafter, the present invention will be described in more
detail.
[0045] Words or terms used in the specification and the appended
claims are not to be interpreted limitedly to common or dictionary
meanings, and shall be interpreted as meanings and concepts
corresponding to technological ideas of the present invention based
on a principle in which inventors may suitably define the concepts
of terms in order to describe their own invention in the best
possible way.
[0046] Unless otherwise defined herein, an alkyl group refers to a
straight-chain and branched aliphatic saturated hydrocarbon group
having 1 to 20 carbon atoms. Specifically, the alkyl group includes
a straight-chain or branched alkyl group having 1 to 20 carbon
atoms, and more specifically 1 to 8 carbon atoms. Specific examples
of the alkyl group may include a methyl group, an ethyl group, an
n-propyl group, an isopropyl group, an n-butyl group, an isobutyl
group, a sec-butyl group, a t-butyl group, a pentyl group, an
iso-amyl group, a hexyl group, a heptyl group, an octyl group, or
the like.
[0047] Further, unless otherwise defined herein, an alkoxy group
refers to a straight-chain or branched alkyl group (--OR) having 1
to 20 carbon atoms which is bonded via an oxygen. Specifically, the
alkyl group includes an alkyl group having 1 to 20 carbon atoms,
and more specifically 1 to 6 carbon atoms. Specific examples of the
alkoxy group include a methoxy group, an ethoxy group, a propoxy
group, a butoxy group, a t-butoxy group, or the like.
[0048] Further, unless otherwise defined herein, the alkoxyalkyl
group refers to a functional group in which a hydrogen atom on a
carbon of the straight-chain or branched alkyl group is substituted
by the alkoxy group as defined above. Specifically, an alkoxyalkyl
group preferably includes an alkoxyalkyl group having 2 to 20
carbon atoms, and more specifically 2 to 12 carbon atoms. Specific
examples of the alkoxyalkyl group may include a methoxymethyl
group, a tert-butoxymethyl group, a tert-butoxyhexyl group, a
1-ethoxyethyl group, a 1-methyl-1-methoxyethyl group, or the
like.
[0049] Further, unless otherwise defined herein, an alkenyl group
refers to a straight-chain and branched aliphatic unsaturated
hydrocarbon group having 2 to 20 carbon atoms and containing a
carbon-carbon double bond. Specifically, the alkenyl group includes
an alkenyl group having 2 to 6 carbon atoms. Specific examples of
the alkenyl group may include an ethenyl group, a propenyl group, a
butenyl group, or the like.
[0050] Further, unless otherwise defined herein, a cycloalkyl group
refers to a cyclic saturated hydrocarbon group having 3 to 20
carbon atoms. Specifically, the cycloalkyl group includes a
cycloalkyl group having 3 to 6 carbon atoms. Specific examples of
the cycloalkyl group may include a cyclopropyl group, a cyclobutyl
group, a cyclohexyl group, or the like.
[0051] Further, unless otherwise defined herein, an aryl group
refers to a carbocyclic aromatic radical having from 6 to 20 carbon
atoms and including one or more rings, wherein such rings may be
attached together in a pendant manner or may be fused.
[0052] Specifically, the aryl group includes an aryl group having 6
to 20 carbon atoms, and more specifically 6 to 12 carbon atoms.
[0053] Specific examples of the aryl group may include a phenyl
group, a naphthyl group, a biphenyl group, or the like.
[0054] Further, unless otherwise defined herein, an arylalkyl group
refers to a functional group (Ar--R--) in which a carbon atom of a
straight-chain or branched alkyl group (R) is substituted by an
aryl group (Ar) which is an aromatic hydrocarbon group.
[0055] Specifically, the arylalkyl group includes an arylalkyl
group having 7 to 20 carbon atoms, and more specifically 7 to 12
carbon atoms.
[0056] Specific examples of the arylalkyl group may include a
benzyl group and a phenylethyl group. Further, unless otherwise
defined herein, an alkylaryl group refers to a functional group
(R--Ar--) in which a carbon atom of an aromatic hydrocarbon group
(Ar) is substituted by a straight-chain or branched alkyl group
(R). Specifically, the alkylaryl group includes an alkylaryl group
having 7 to 20 carbon atoms, and more specifically 7 to 12 carbon
atoms.
[0057] Further, unless otherwise defined herein, an aryloxy group
refers to an aryl group (--OAr) which is bonded via an oxygen,
wherein the aryl group is as defined above. Specifically, the
aryloxy group includes an aryloxy group having 6 to 20 carbon
atoms, and more specifically 6 to 12 carbon atoms. Specific
examples of the aryloxy group may include phenoxy or the like.
[0058] Further, unless otherwise defined herein, a silyl group
refers to a --SiH.sub.3 radical derived from silane, wherein at
least one of hydrogen atoms in the silyl group may be substituted
with various organic groups such as an alkyl group and a halogen
group.
[0059] Further, unless otherwise defined herein, a nitro group
refers to a --NO.sub.2 radical in which one nitrogen atom and two
oxygen atoms are bonded.
[0060] Further, unless otherwise defined herein, a sultanate group
refers to a functional group in which hydrogen in the sulfonic acid
group (--SO.sub.3H) is substituted with an alkyl group, wherein the
alkyl group is as defined above. Specifically, the sulfonate group
may be --SO.sub.3R (where R is a straight-chain or branched alkyl
group having 1 to 20 carbon atoms).
[0061] Further, unless otherwise defined herein, an amido group
refers to an amino group bonded to a carbonyl group (C.dbd.O).
[0062] Further, unless otherwise defined herein, an alkylamino
group refers to a functional group in which at least one hydrogen
in the amino group (--NH.sub.2) is substituted with an alkyl group,
wherein the alkyl group is as defined above. Specifically, the
alkylamino group may be --NR.sub.2 (where each R may be a hydrogen
atom or a straight-chain or branched alkyl group having 1 to 20
carbon atoms, with the proviso that both of two Rs are not hydrogen
atoms).
[0063] Further, unless otherwise defined herein, an arylamino group
refers to a functional group in which at least one hydrogen in the
amino group (--NH.sub.2) is substituted with an aryl group, wherein
the aryl group is as defined above.
[0064] Further, unless otherwise defined herein, an alkylidene
group refers to a divalent aliphatic hydrocarbon group in which two
hydrogen atoms have been removed from the same carbon atom of the
alkyl group. Specifically, the alkylidene group includes an
alkylidene group having 1 to 20 carbon atoms, and more specifically
1 to 12 carbon atoms. Specific examples of the alkylidene group may
include a propane-2-ylidene group, or the like.
[0065] Further, unless otherwise defined herein, a hydrocarbyl
group refers to a monovalent hydrocarbon group having 1 to 60
carbon atoms consisting only of the carbon and hydrogen, regardless
of its structure, such as an alkyl group, an aryl group, an alkenyl
group, an alkylaryl group, and an arylalkyl group.
[0066] Further, unless otherwise defined herein, "combination
thereof" means two or more functional groups bonding through a
linking group such as a single bond, a double bond (ethylene
group), a triple bond (acetylene group) or an alkylene group having
1 to 20 carbon atoms (for example, a methylene group
(--CH.sub.2--), an ethylene group (--CH.sub.2CH.sub.2--) or the
like), or two or more functional groups being fused and linked.
[0067] Transition Metal Compound
[0068] In one embodiment of the present invention, a Group 4
transition metal as a central metal is linked by a specific ligand
structure rich in electrons and widely delocalized while having a
rigid planar structure, and an amino group substituted with a silyl
group, and therefore, a transition metal compound exhibiting
excellent structural stability together with excellent
polymerization reactivity is provided.
[0069] Specifically, the transition metal compound according to one
embodiment of the present invention has a structure of the
following Chemical Formula 1.
##STR00003##
[0070] In Chemical Formula 1,
[0071] A is carbon (C), silicon (Si), or germanium (Ge);
[0072] Y is oxygen (O) or sulfur (S);
[0073] M is a Group 4 transition metal;
[0074] X.sup.1 and X.sup.2 are the same as or different from each
other, and are each independently a halogen, a substituted or
unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted
C2 to C20 alkenyl group, a substituted or unsubstituted C6 to C20
aryl group, a nitro group, an amido group, a substituted or
unsubstituted C1 to C20 alkylamino group, a substituted or
unsubstituted C6 to C20 arylamino group, a substituted or
unsubstituted C1 to C20 alkylsilyl group, a substituted or
unsubstituted to C20 alkoxy group, or a substituted or
unsubstituted C1 to C20 sulfonate group;
[0075] R.sup.1 is a substituted or unsubstituted C1 to C20 alkyl
group, a substituted or unsubstituted al to C20 alkoxy group, a
substituted or unsubstituted C2 to C20 alkenyl group, a substituted
or unsubstituted C6 to C20 aryl group, a substituted or
unsubstituted C7 to C20 alkylaryl group, or a substituted or
unsubstituted C7 to C20 arylalkyl group;
[0076] R.sup.2 and R.sup.3 are the same as or different from each
other, and are each independently hydrogen, a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C2 to C20 alkoxyalkyl group, a substituted or
unsubstituted C6 to C20 aryl group, a substituted or unsubstituted
C7 to C20 alkylaryl group, or a substituted or unsubstituted C7 to
C20 arylalkyl group, or R.sup.2 and R.sup.3 are linked to each
other to form a substituted or unsubstituted aliphatic or aromatic
ring; and
[0077] R.sup.4 to R.sup.6 are the same as or different from each
other, and are each independently hydrogen, a substituted or
unsubstituted C1 to C20 alkyl, a substituted or unsubstituted C2 to
C20 alkenyl, a substituted or unsubstituted C6 to C20 aryl group, a
substituted or unsubstituted C7 to C20 alkylaryl, or a substituted
or unsubstituted C7 to C20 arylalkyl.
[0078] Further, in Chemical Formula 1, the functional groups
R.sup.1 to R.sup.6, X.sup.1, and X.sup.2 may each independently be
further substituted with one or more substituents selected from the
group consisting of a halogen group, an alkyl group having 1 to 20
carbon atoms, a haloalkyl group having 1 to 20 carbon atoms, an
alkenyl group having 2 to 20 carbon atoms, an alkoxy group having 1
to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms,
an aryl group having 6 to 20 carbon atoms, an arylalkyl group
having 7 to 20 carbon atoms, an alkylaryl group having 7 to 20
carbon atoms, and an aryloxy group having 6 to 20 carbon atoms.
[0079] In a transition metal compound according to the present
invention, a Group 4 transition metal as a central metal is linked
by an indeno-fused benzofuran or benzothiophene ligand having a
specific structure and substituents rich in electrons and widely
delocalized while having a rigid planar structure, and an amino
group substituted with a silyl group, and therefore, the transition
metal compound is capable of exhibiting excellent structural
stability together with excellent polymerization reactivity by
maintaining a pentagonal ring structure.
[0080] In the transition metal compound of Chemical Formula 1
according to one embodiment of the present invention, the metal
site is linked by an indeno-fused benzofuran or benzothiophene
ligand introducing an amino group substituted with a silyl group.
As a result, approaches of monomers having large steric hindrance
may be more facilitated and copolymerizability can be improved. In
addition, in the transition metal compound of Chemical Formula 1,
the indeno-fused benzofuran or benzothiophene ring, Si of the silyl
group and nitrogen (N) of the amino group may form a more stable
and rigid pentagonal ring structure with the central metal (M) due
to ring-type bonding. In other words, the nitrogen atom of the
amino group is linked by two bonds with the silyl group bridge in a
ring form, and therefore, a more rigid complex compound structure
may be obtained. Thus, when applied to olefin polymerization to
improve copolymerizability under high temperature commercialization
conditions, a large alpha-olefin as well as high molecular weight
and low density polyolefin, particularly, linear low density
polyethylene, can be introduced, and therefore an ultra-low density
polyolefin copolymer having a density of 0.91 g/cc or less can be
prepared.
[0081] In addition, various substituents may be introduced to the
indeno-fused benzofuran or benzothiophene ring and the silyl group.
As a result, electronic and steric environments around the metal
may be controlled, and structures, physical properties, and the
like of the produced polyolefin may be readily controlled.
Accordingly, the transition metal compound of Chemical Formula 1
may be useful as a catalyst for preparing an olefin-based polymer,
however, the use is not limited thereto, and the transition metal
compound is capable of being applied in all usable fields.
[0082] Specifically, in Chemical Formula 1, M may be selected from
the group consisting of titanium (Ti), zirconium (Zr), and hafnium
(Hf), and more specifically, may be titanium (Ti).
[0083] In Chemical Formula 1, A may be selected from the group
consisting of carbon, silicon, and germanium, and more
specifically, may be silicon (Si).
[0084] In Chemical Formula 1, Y is O or S, and more specifically,
may be S.
[0085] Further, in Chemical Formula 1, X.sup.1 and X.sup.2 may each
independently be selected from the group consisting of a halogen, a
substituted or unsubstituted alkyl group having 1 to 20 carbon
atoms, a substituted or unsubstituted alkenyl group having 2 to 20
carbon atoms, a substituted or unsubstituted aryl group having 6 to
20 carbon atoms, a nitro group, an amido group, a substituted or
unsubstituted alkylamino group having 1 to 20 carbon atoms, a
substituted or unsubstituted arylamino group having 6 to 20 carbon
atoms, a substituted or unsubstituted alkylsilyl group having 1 to
20 carbon atoms, a substituted or unsubstituted alkoxy group having
1 to 20 carbon atoms, and a substituted or unsubstituted sulfonate
group having 1 to 20 carbon atoms. More specifically, X.sup.1 and
X.sup.2 may each independently be an alkyl group having 1 to 6
carbon atoms, and even more specifically, may be a methyl group or
an ethyl group.
[0086] In Chemical Formula 1, R.sup.1 may be selected from the
group consisting of a substituted or unsubstituted alkyl group
having 1 to 20 carbon atoms, a substituted or unsubstituted alkoxy
group having 1 to 20 carbon atoms, a substituted or unsubstituted
alkenyl group having 2 to 20 carbon atoms, a substituted or
unsubstituted aryl group having 6 to 20 carbon atoms, a substituted
or unsubstituted alkylaryl group having 7 to 20 carbon atoms, and a
substituted or unsubstituted arylalkyl group having 7 to 20 carbon
atoms. Specifically, R.sup.1 may be selected from the group
consisting of an alkyl group having 1 to 8 carbon atoms, an alkoxy
group having 1 to 8 carbon atoms, and an aryl group having 6 to 12
carbon atoms. More specifically, R.sup.1 may be a methyl group, an
ethyl group, a propyl group, an isopropyl group, an n-butyl group,
a tert-butyl group, a pentyl group, a hexyl group, a heptyl group,
an octyl group, a phenyl group, a halogen group, a methoxy group,
or an ethoxy group.
[0087] Further, in Chemical Formula 1, R.sup.2 and R.sup.3 may each
independently be selected from the group consisting of a hydrogen
atom, a halogen group, a substituted or unsubstituted alkyl group
having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl
group having 2 to 20 carbon atoms, a substituted or unsubstituted
alkoxyalkyl group having 2 to 20 carbon atoms, a substituted or
unsubstituted aryl group having 6 to 20 carbon atoms, a substituted
or unsubstituted alkylaryl group having 7 to 20 carbon atoms, and a
substituted or unsubstituted arylalkyl group having 7 to 20 carbon
atoms, or R.sup.2 and R.sup.3 may be linked to each other to form a
substituted or unsubstituted aliphatic or aromatic ring.
Specifically, R.sup.2 and R.sup.3 may be linked to each other to
form an aliphatic ring having 4 to 8 carbon atoms or an aromatic
ring having 4 to 8 carbon atoms. Specifically, R.sup.2 and R.sup.3
may each independently be selected from the group consisting of an
alkyl group having 1 to 6 carbon atoms and an aryl group having 6
to 12 carbon atoms, or R.sup.2 and R.sup.3 may be linked to each
other to form an aliphatic or aromatic ring having 4 to 6 carbon
atoms. More specifically, R.sup.2 and R.sup.3 may each
independently be hydrogen, a methyl group, an ethyl group, a propyl
group, an isopropyl group, an n-butyl group, a tert-butyl group, a
methoxymethyl group, a tert-butoxymethyl group, a tert-butoxyhexyl
group, a 1-ethoxyethyl group, a 1-methyl-1-methoxyethyl group, or a
phenyl group.
[0088] Further, in Chemical Formula 1, R.sup.4 to R.sup.6 may each
independently be selected from the group consisting of a hydrogen
atom, a substituted or unsubstituted alkyl group having 1 to 20
carbon atoms, a substituted or unsubstituted alkenyl group having 2
to 20 carbon atoms, a substituted or unsubstituted aryl group
having 6 to 20 carbon atoms, a substituted or unsubstituted
alkylaryl group having 7 to 20 carbon atoms, and a substituted or
unsubstituted arylalkyl group having 7 to 20 carbon atoms, and
these functional groups may be independently substituted with one
or more substituents selected from the group consisting of a
halogen group, an alkyl group having 1 to 10 carbon atoms, a
haloalkyl group having 1 to 10 carbon atoms, an alkenyl group
having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon
atoms, a cycloalkyl group having 3 to 12 carbon atoms, an aryl
group having 6 to 12 carbon atoms, an arylalkyl group having 7 to
12 carbon atoms, an alkylaryl group having 7 to 12 carbon atoms,
and an aryloxy group having 6 to 12 carbon atoms. Specifically,
R.sup.4 to R.sup.6 may be a straight-chain or branched alkyl group
having 1 to 8 carbon atoms or an aryl group having 6 to 12 carbon
atoms, and these functional groups may be independently substituted
with one or more substituents selected from the group consisting of
a halogen group, an alkyl group having 1 to 10 carbon atoms, and a
haloalkyl group having 1 to 10 carbon atoms. More specifically.
R.sup.4 to R.sup.6 may each independently be hydrogen, a methyl
group, an ethyl group, a propyl group, or a phenyl group.
[0089] In Chemical Formula 1, more preferred compounds for
controlling electronic and steric environments around the metal (M)
may be more specifically selected from the group consisting of
compounds represented by the following structural formulae.
##STR00004##
[0090] As will be described in more detail hereinafter, a
transition metal compound of Chemical Formula 1 may be a final
product produced by reacting a ligand compound having a specific
structure with an organolithium-based compound and then reacting
the resultant reaction product with a transition metal compound in
the presence of a Grignard reagent or an organolithium-based
compound, thereby introducing a transition metal group in a
specific ligand compound.
[0091] Method for Preparing Transition Metal Compound
[0092] In another embodiment of the present invention, any one of
several methods of preparing the aforementioned transition metal
compounds is presented.
[0093] Specifically, a method for preparing a transition metal
compound represented by the following Chemical Formula 1 is
provided, including the steps of: reacting a ligand compound
represented by the following Chemical Formula 2 with an
organolithium-based compound, and then reacting the resultant
reaction product with a compound represented by the following
Chemical Formula 3, and a Grignard compound or an
organolithium-based compound.
##STR00005##
[0094] In Chemical Formulae 1, 2, and 3,
[0095] A is carbon, silicon, or germanium;
[0096] Y is O or S;
[0097] M is a Group 4 transition metal;
[0098] X.sup.1 and X.sup.2 are the same as or different from each
other, and are each independently a halogen, a substituted or
unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted
C2 to C20 alkenyl group, a substituted or unsubstituted C6 to C20
aryl group, a nitro group, an amido group, a substituted or
unsubstituted C1 to C20 alkylamino group, a substituted or
unsubstituted C6 to C20 arylamino group, a substituted or
unsubstituted C1 to C20 alkylsilyl group, a substituted or
unsubstituted C1 to C20 alkoxy group, or a substituted or
unsubstituted C1 to C20 sulfonate group;
[0099] R.sup.1 is a substituted or unsubstituted C1 to C20 alkyl
group, a substituted or unsubstituted C1 to C20 alkoxy group, a
substituted or unsubstituted C2 to C20 alkenyl group, a substituted
or unsubstituted C6 to C20 aryl group, a substituted or
unsubstituted C7 to C20 alkylaryl group, or a substituted or
unsubstituted C7 to C20 arylalkyl group;
[0100] R.sup.2 and R.sup.3 are the same as or different from each
other, and are each independently hydrogen, a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C2 to C20 alkoxyalkyl group, a substituted or
unsubstituted C6 to C20 aryl group, a substituted or unsubstituted
C7 to C20 alkylaryl group, or a substituted or unsubstituted C7 to
C20 arylalkyl group, or R.sup.2 and R.sup.3 are linked to each
other to form a substituted or unsubstituted aliphatic or aromatic
ring; and
[0101] R.sup.4 to R.sup.6 are the same as or different from each
other, and are each independently hydrogen, a substituted or
unsubstituted C1 to C20 alkyl, a substituted or unsubstituted C2 to
C20 alkenyl, a substituted or unsubstituted C6 to C20 aryl group, a
substituted or unsubstituted C7 to C20 alkylaryl, or a substituted
or unsubstituted C7 to C20 arylalkyl.
[0102] Here, detailed description of the structural formulae and
substituents A, Y, M, X.sup.1, X.sup.2, and R.sup.1 to R.sup.6
related to Chemical Formula 1 are as previously described.
[0103] Meanwhile, the method for preparing a transition metal
compound according to the present invention may further include a
step of reacting a compound of the following Chemical Formula 4
with a compound of the following Chemical Formula 5 to prepare the
ligand compound of Chemical Formula 2.
##STR00006##
[0104] In Chemical Formulae 4 and 5,
[0105] A, Y, and R.sup.1 to R.sup.6 are as defined above, and
Q.sup.2 is a halogen group.
[0106] In addition, the method for preparing a transition metal
compound according to the present invention may, before reacting
the compound of Chemical Formula 4 with the compound of Chemical
Formula 5, further include a step of reacting a compound of the
following Chemical Formula 6 with a compound of the following
Chemical Formula 7 in the presence of an organolithium-based
compound to prepare the compound of Chemical Formula 4.
##STR00007##
[0107] In Chemical Formulae 6 and 7,
[0108] A, Y, R.sup.1 to R.sup.3, and Q.sup.2 are as described
above, and Q.sup.1 is a halogen group.
[0109] The transition metal compound according to the present
invention has excellent structural stability together with
excellent polymerization reactivity, and can exhibit excellent
copolymerizability at a high temperature. As a result, the
transition metal compound is useful for the preparation of
olefin-based polymers, especially high molecular weight and low
density polyethylene. In addition, since approaches of monomers
having large steric hindrance are more facilitated structurally, it
is possible to prepare a novel ligand compound and a novel
transition metal compound containing the same, which are
particularly useful for the preparation of copolymers of ethylene
and alpha olefins.
[0110] In particular, the transition metal compound prepared
according to the preparation method of the present invention can be
used as a catalyst for preparing an olefin-based polymer. More
specifically, in the compound of Chemical Formula 1, an
indeno-fused benzofuran or benzothiophene ligand and an amino group
are stably crosslinked by a bridge A, and the nitrogen atom of the
amino group is coordinatively bonded to the center metal (M) in the
transition metal compound, whereby a stable and rigid pentagonal
ring structure can be formed. Consequently, not only are approaches
of monomers having large steric hindrance facilitated, but also
excellent copolymerizability under high temperature conditions can
be exhibited. As a result, when applied to olefin polymerization,
large quantities of alpha-olefin as well as high molecular weight
and low density polyolefin, particularly, linear low density
polyethylene, can be introduced, and therefore, an ultra-low
density polyolefin copolymer having a density of 0.91 g/cc or less
can be prepared.
[0111] Further, the compound of Chemical Formula 1 can control the
electronic and steric environments around the metal by introducing
a substituent into a specific site of the benzene ring of the
indene group in the indeno-fused benzofuran or benzothiophene
ligand, i.e., by substituting R.sup.1 with a separate substituent
other than hydrogen, and thereby the structure and physical
properties of the produced polyolefin can be easily controlled.
Specifically, in Chemical Formula 1, when R.sup.1 is an alkyl group
having 1 to 6 carbon atoms such as methyl, ethyl, propyl,
isopropyl, n-butyl, t-butyl, pentyl, or hexyl, and more
specifically an alkyl group having 2 to 6 carbon atoms, it can
exhibit superior copolymerizability under high temperature
conditions. Further, the transition metal compound prepared using
the aforementioned ligand compound can exhibit high catalytic
activity due to its electronic and steric structure in the process
of preparing olefin-based polymers. Thus, an ultra-low density
polyolefin copolymer can be prepared.
[0112] Specifically, the transition metal compound of Chemical
Formula 1 according to an embodiment of the present invention can
be prepared by reacting the compound of Chemical Formula 2 with the
compound of Chemical Formula 3 as shown in Reaction Scheme 1 below.
The following Reaction Scheme 1 is only one example for
illustrating the present invention, but the present invention is
not limited thereto.
##STR00008##
[0113] In Reaction Scheme 1, A, Y, M, X.sup.1, and X.sup.2, and
R.sup.1 to R.sup.6 are as previously defined.
[0114] Meanwhile, in the preparation of the transition metal
compound of Chemical Formula 1 according to the present invention,
the organolithium-based compound specifically includes alkyllithium
(R--Li, the alkyl group is as defined above, and specifically, a
straight-chain alkyl group having 1 to 8 carbon atoms), cycloalkyl
lithium (wherein the cycloalkyl group is as defined above, and
specifically a cycloalkyl group having 3 to 12 carbon atoms), allyl
lithium, vinyl lithium, aryl lithium (wherein the aryl group is as
defined above, and specifically an aryl group having 6 to 12 carbon
atoms), arylalkyl lithium (wherein the arylalkyl group is as
defined above, and specifically an arylalkyl group having 7 to 12
carbon atoms), or alkylaryl lithium (wherein the alkylaryl group is
as defined above, and specifically an alkylaryl group having 7 to
12 carbon atoms). More specifically, the organolithium-based
compound includes methyl lithium, ethyl lithium, isopropyl lithium,
n-butyllithium, sec-butyllithium, t-butyl lithium, isobutyl
lithium, pentyl lithium, isopentyl lithium, cyclopentyl lithium,
cyclohexyl lithium, hexyl lithium, octyl lithium, allyl lithium,
vinyl lithium, phenyl lithium, benzyl lithium, and the like, and
any one or a mixture of two or more thereof may be used. Among
them, the organolithium-based compound may be methyl lithium,
n-butyl lithium, t-butyl lithium, or a mixture thereof, in
consideration of excellent reactivity.
[0115] The organolithium-based compound may be used in a
stoichiometric ratio with respect to the ligand compound of
Chemical Formula 2, and specifically, the ligand compound of
Chemical Formula 2 and the organolithium-based compound may be used
in a molar ratio of 1:1 to 1:3 and more specifically in a molar
ratio of 1:1 to 1:2.
[0116] In addition, in the preparation of the transition metal
compound of Chemical Formula 1 according to the present invention,
the reaction of the ligand compound of Chemical Formula 2 and the
organolithium-based compound may be carried out at a temperature of
-90.degree. C. to 10.degree. C., and more specifically at a
temperature of -78.degree. C. to 10.degree. C., and through the
reaction of the ligand compound of Chemical Formula 2 and the
organolithium-based compound, a dilithium compound is produced.
[0117] Next, in the preparation of the transition metal compound of
Chemical Formula 1 according to the present invention, the compound
of Chemical Formula 3, and a Grignard reagent or an
organolithium-based compound are added to the reaction product
obtained as a result of the reaction of the ligand compound of
Chemical Formula 2 and an organolithium-based compound, and
reacted. Herein, the organolithium-based compound may be the same
as described above.
[0118] Specifically, the compound of Chemical Formula 3 may be
TiCl.sub.4, ZrCl.sub.4, or HfCl.sub.4, and any one or a mixture of
two or more thereof may be used. In addition, the compound of
Chemical Formula 3 may be used in an amount of 1 to 1.2
equivalents. Meanwhile, in the present invention, the equivalent
refers to molar equivalent.
[0119] In addition, the Grignard reagent may specifically include a
compound represented by the following Chemical Formula 13.
R'MgX [Chemical Formula 13]
[0120] In Chemical Formula 13, R.sup.1 is selected from the group
consisting of an alkyl group having 1 to 20 carbon atoms, an aryl
group having 6 to 20 carbon atoms, and an arylalkyl group having 7
to 20 carbon atoms, X is a halogen group.
[0121] More specifically, the Grignard reagent may be MeMgBr,
EtMgCl (wherein Me is a methyl group and Et is an ethyl group), and
the like, and may be used in an amount of 2 to 2.5 equivalents.
[0122] The reaction of the compound of Chemical Formula 3, and a
Grignard reagent or an organolithium-based compound for the
reaction product obtained as a result of the reaction between the
compound of Chemical Formula 2 and the organolithium-based
compound, may be carried out at a temperature of -90.degree. C. to
10.degree. C., and more specifically at a temperature of
-78.degree. C. to 10.degree. C.
[0123] As an example, the transition metal compound of Chemical
Formula 1 can be prepared by a method as shown in the following
Reaction Scheme 2, but is not limited thereto.
[0124] The preparation method can be further specified in
preparation examples described hereinafter.
##STR00009##
[0125] In Reaction Scheme 2, R may be H, methyl (Me), isopropyl
(iPr), or t-butyl (tBu), but is not limited thereto.
[0126] Through the preparation processes as above, the transition
metal compound of Chemical Formula 1 having a unique structure as
described above and thereby having excellent polymerization
reactivity and structural stability may be prepared.
[0127] Meanwhile, the ligand compound of Chemical Formula 2, which
is a precursor compound used in the preparation of the transition
metal compound of Chemical Formula 1 according to the present
invention, can be prepared by the reaction of the compound of
Chemical Formula 4 and the compound of Chemical Formula 5 as shown
in the following Reaction Scheme 3. Reaction Scheme 3 is only an
example for illustrating the present invention, and the present
invention is not limited thereto.
##STR00010##
[0128] In Reaction Scheme 3, A, Y, R.sup.1 to R.sup.6, and Q.sup.2
are as defined above.
[0129] The reaction of the compound of Chemical Formula 4 and the
compound of Chemical Formula 5 may be carried out under a
temperature condition of -80 to 50.degree. C.
[0130] Further, the compound of Chemical Formula 4 and the compound
of Chemical Formula 5 may be used in a stoichiometric ratio, and
specifically, the compound of Chemical Formula 5 may be used in a
molar ratio of about 5 to 10 equivalents, more specifically about 7
to 8 equivalents, based on 1 equivalent of the compound of Chemical
Formula 4.
[0131] Further, the reaction may be carried out in a non-polar
solvent such as toluene, pentane, hexane, or benzene.
[0132] Meanwhile, the compound of Chemical Formula 5, which can be
used for the preparation of the compound of Chemical Formula 2, may
specifically be a primary amine compound containing
--(CR.sup.4R.sup.5R.sup.6), wherein R.sup.4 to R.sup.6 are as
defined above.
[0133] More specifically, when considering the excellent catalytic
activity and copolymerizability of the ligand compound and the
transition metal compound finally prepared, in the compound of
Chemical Formula 5, R.sup.4 to R.sup.6 may each independently be
hydrogen, a C1 to C6 alkyl group, or a C6 to C12 aryl group, and
still more specifically, R.sup.4 to R.sup.6 may each independently
be a C1 to C4 alkyl group. Further, these functional groups may be
substituted with one or more substituents selected from the group
consisting of a halogen group, a C1 to 010 alkyl group, and a C1 to
C10 haloalkyl group. As an example, the compound of Chemical
Formula 5 may be t-BuNH.sub.2, n-BuNH.sub.2, or the like.
[0134] Further, the compound of Chemical Formula 4, which can be
used for the preparation of the compound of Chemical Formula 2 by
reacting with the compound of Chemical Formula 5, can be prepared
using a conventional organic reaction, but the preparation method
thereof is not particularly limited. In the present invention, the
compound of Chemical Formula 4 may be prepared by reacting a
compound of Chemical Formula 6 with a compound of Chemical Formula
7 in the presence of an organolithium-based compound as shown in
the following Reaction Scheme 4. Accordingly, the method of
preparing a ligand compound according to one embodiment of the
present invention may further include a step of reacting a compound
of the following Chemical Formula 6 with a compound of the
following Chemical Formula 7 to prepare a compound of Chemical
Formula 4.
##STR00011##
[0135] In Reaction Scheme 4, A, Y, R.sup.1 to R.sup.3, and Q.sup.2
are as defined above, and Q.sup.1 is a halogen group such as
fluoro, bromo, chloro, or iodo. In this case, Q' may be the same as
or different from Q.sup.2.
[0136] Further, the compound of Chemical Formula 7, which can be
used for the preparation of the compound of Formula 4 by reacting
with the compound of Chemical Formula 6, may specifically be
dichlorodimethylsilane (SiMe.sub.2Cl.sub.2) or the like. The
compound of Chemical Formula 7 may be used in a stoichiometric
ratio with respect to the compound of Chemical Formula 6, and
specifically, the compound of Chemical Formula 7 may be used in an
amount of about 1 to 5 equivalents, more specifically about 1 to 3
equivalents, based on 1 equivalent of the compound of Chemical
Formula 6.
[0137] Further, the reaction for preparing the compound of Chemical
Formula 4 may be carried out in an aprotic polar solvent such as
tetrahydrofuran, dimethoxyethane, diethyl ether, or
dichloromethane.
[0138] Meanwhile, the compound of Chemical Formula 6, which can be
used for the preparation of the compound of Chemical Formula 4, is
not particularly limited and may be prepared using conventional
organic reactions.
[0139] Specifically, in the present invention, the compound of
Chemical Formula 6 can be prepared by the preparation method
including the steps of: (S1) preparing a compound of Chemical
Formula 10 by performing Kumada coupling reaction of a compound of
Chemical Formula 8 with a compound of Chemical Formula 9 in the
presence of a catalyst; (S2) preparing a compound of Chemical
Formula 12 by reacting the compound of Chemical Formula 10 with a
carbonyl-based compound of Chemical Formula 11 in the presence of
an organolithium compound; and (S3) performing Wolff-Kishner
reaction of the compound of Chemical Formula 12 with hydrazine.
Accordingly, the ligand compound according to the present invention
may further include steps S3, S2+S3, or S1+S2+S3. The following
Reaction Scheme 5 is only an example for illustrating the present
invention, and the present invention is not limited thereto.
##STR00012##
[0140] In Reaction Scheme 5,
[0141] Y, and R.sup.1 are as defined above,
[0142] Q.sup.3 is a halogen group such as bromo, chloro, or iodine,
or OTf (triflate, CF.sub.3SO.sub.2O--), and
[0143] Q.sup.4 is --MgQ.sup.3', where Q.sup.3' is the same as
Q.sup.3 defined above.
[0144] In Reaction Scheme 5, R'' and R may each independently be a
C1 to 06 alkyl group such as methyl, ethyl, or the like.
[0145] As the catalyst in step S1, nickel catalysts such as
[1,3-bis(diphenylphosphino)propane]dichloronickel(II)
(NidpppCl.sub.2), Ni(dppe)Cl.sub.2, Ni(dppf)Cl.sub.2,
Ni(dppb)Cl.sub.2, Ni(dppe)(OTf).sub.2, Ni(dppp)(OTf).sub.2,
Ni(dppf)(OTf).sub.2, or Ni(dppb)(OTf).sub.2; or palladium catalysts
such as Pd.sub.2(dba).sub.3, Pd(PPh.sub.3).sub.4, or
Pd(PPh.sub.3).sub.2Cl.sub.2 may be used. The catalyst may be used
in an amount of 0.005 to 0.05 mol, more specifically 0.01 to 0.03
mol, based on 1 mol of the compound of Chemical Formula 6.
[0146] In step S1, the compound of Chemical Formula 7 and the
compound of Chemical Formula 8 may be used in a stoichiometric
ratio, and specifically, the compound of Chemical Formula 8 may be
used in a molar ratio of 1 to 1.5 mol, more specifically in a molar
ratio of 1 to 1.2 based on 1 mol of the compound of Chemical
Formula 7, or it may be used in an amount of 1 to 1.5 equivalents,
more specifically 1 to 1.2 equivalents based on 1 equivalent of the
compound of Chemical Formula 7.
[0147] Meanwhile, in step S2, as the organolithium-based compound,
the compounds as described above may be used. The
organolithium-based compound may be used in a stoichiometric ratio
with respect to the compound of Chemical Formula 8, and
specifically, the organolithium-based compound may be used in an
amount of 1 to 3 equivalents, more specifically 1.5 to 2.5
equivalents, based on 1 equivalent of the compound of Chemical
Formula 9.
[0148] Further, during the reaction in step S2, a Lewis base such
as hexamethylphosphoramide (HMPA), tetramethylethylenediamine
(TMEDA), pentamethyldiethylenetriamine (PMDETA),
1,2-dimethoxyethane (glyme), bis(2-methoxyethyl)ether (diglyme),
dioxan, or tetrahydrofuran (THF) may be used. The Lewis base may be
used in a stoichiometric ratio with respect to the compound of
Chemical Formula 8, and specifically, the Lewis base may be used in
an amount of 1 to 3 equivalents, more specifically 1.5 to 2.5
equivalents, based on 1 equivalent of the compound of Chemical
Formula 8.
[0149] Further, in step S2, the compound of Chemical Formula 9 may
specifically be ethyl dimethyl carbamate
(CH.sub.3CH.sub.2OCON(CH.sub.3).sub.2) or the like. The compound of
Chemical Formula 10 may be used in a stoichiometric ratio with
respect to the compound of Chemical Formula 9, and specifically,
the compound of Chemical Formula 10 may be used in an amount of 1
to 3 equivalents, more specifically 1 to 2.5 equivalents, based on
1 equivalent of the compound of Chemical Formula 9.
[0150] Further, in step S3, the Wolff-Kishner reaction may be
carried out at a temperature of 70 to 90.degree. C., and more
specifically 70 to 80.degree. C.
[0151] Further, in step S3, hydrazine can be used in a
stoichiometric ratio with respect to the compound of Chemical
Formula 11, and specifically, hydrazine can be used in an amount of
1 to 6 equivalents, more specifically, 3 to 5.5 equivalents, based
on 1 equivalent of the compound of Chemical Formula 11.
[0152] As an example, the compound of Chemical Formula 5 can be
prepared by a method as shown in the following Reaction Scheme 6,
but is not limited thereto. The above preparation method can be
further specified in preparation examples described
hereinafter.
##STR00013##
[0153] In Reaction Scheme 6, R.sup.1 is as defined above, and
specifically, may be methyl, ethyl, or isopropyl.
[0154] Specifically, according to one embodiment of the present
invention, a method for preparing a transition metal compound
represented by the following Chemical Formula 1 is provided,
including the steps of:
[0155] reacting a compound of the following Chemical Formula 4 with
a compound of the following Chemical Formula 5 to prepare a ligand
compound of the following Chemical Formula 2; and
[0156] reacting the ligand compound of Chemical Formula 2 with an
organolithium-based compound, and then reacting the resultant
reaction product with a compound represented by the following
Chemical Formula 3, and a Grignard compound or an
organolithium-based compound.
##STR00014##
[0157] In Chemical Formulae 1, 2, 3, 4, and 5,
[0158] A is carbon, silicon, or germanium;
[0159] Y is O or S;
[0160] M is a Group 4 transition metal;
[0161] X.sup.1 and X.sup.2 are the same as or different from each
other, and are each independently a halogen group, a substituted or
unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted
C2 to C20 alkenyl group, a substituted or unsubstituted C6 to C20
aryl group, a nitro group, an amido group, a substituted or
unsubstituted C1 to C20 alkylamino group, a substituted or
unsubstituted C6 to C20 arylamino group, a substituted or
unsubstituted C1 to C20 alkylsilyl group, a substituted or
unsubstituted C1 to C20 alkoxy group, or a substituted or
unsubstituted C1 to C20 sulfonate group;
[0162] R.sup.1 is a substituted or unsubstituted C1 to C20 alkyl
group, a substituted or unsubstituted C1 to C20 alkoxy group, a
substituted or unsubstituted C2 to C20 alkenyl group, a substituted
or unsubstituted C6 to C20 aryl group, a substituted or
unsubstituted C7 to C20 alkylaryl group, or a substituted or
unsubstituted C7 to C20 arylalkyl group;
[0163] R.sup.2 and R.sup.3 are the same as or different from each
other, and are each independently hydrogen, a halogen, a
substituted or unsubstituted C1 to C20 alkyl group, a substituted
or unsubstituted C2 to C20 alkenyl group, a substituted or
unsubstituted C2 to C20 alkoxyalkyl group, a substituted or
unsubstituted C6 to C20 aryl group, a substituted or unsubstituted
C7 to C20 alkylaryl group, or a substituted or unsubstituted C7 to
C20 arylalkyl group, or R.sup.2 and R.sup.3 are linked to each
other to form a substituted or unsubstituted aliphatic or aromatic
ring;
[0164] R.sup.4 to R.sup.6 are the same as or different from each
other, and are each independently hydrogen, a substituted or
unsubstituted C1 to C20 alkyl, a substituted or unsubstituted C2 to
C20 alkenyl, a substituted or unsubstituted C6 to C20 aryl group, a
substituted or unsubstituted C7 to C20 alkylaryl, or a substituted
or unsubstituted C7 to C20 arylalkyl; and
[0165] Q.sup.2 is a halogen.
[0166] More specifically, according to another preferred embodiment
of the present invention,
[0167] a method for preparing a transition metal compound
represented by the following Chemical Formula 1 is provided,
including the steps of:
[0168] reacting a compound of the following Chemical Formula 6 with
a compound of the following Chemical Formula 7 in the presence of
an organolithium-based compound to prepare a ligand compound of the
following Chemical Formula 4;
[0169] reacting the compound of Chemical Formula 4 with a compound
of the following Chemical Formula 5 to prepare a ligand compound of
the following Chemical Formula 2; and
[0170] reacting the ligand compound of Chemical Formula 2 with an
organolithium-based compound, and then reacting the resultant
reaction product with a compound represented by the following
Chemical Formula 3, and a Grignard compound or an
organolithium-based compound.
##STR00015##
[0171] In Chemical Formulae 1, 2, 3, 4, 5, 6, and 7,
[0172] A, Y, and R.sup.1 to R.sup.6 are as defined above, and
[0173] Q.sup.1 and Q.sup.2 are the same as or different from each
other and each is independently a halogen group.
[0174] More specifically, according to another preferred embodiment
of the present invention,
[0175] a method for preparing a compound of the following Chemical
Formula 1 is provided, including the steps of:
[0176] performing a Wolff-Kishner reaction of the compound of
Chemical Formula 12 with hydrazine to prepare a compound of the
following Chemical Formula 6;
[0177] reacting the compound of Chemical Formula 6 with a compound
of the following Chemical Formula 7 in the presence of an
organolithium-based compound to prepare a compound of the following
Chemical Formula 4;
[0178] reacting the compound of Chemical Formula 4 with a compound
of the following Chemical Formula 5 to prepare a ligand compound of
the following Chemical Formula 2; and
[0179] reacting the ligand compound of Chemical Formula 2 with an
organolithium-based compound, and then reacting the resultant
reaction product with a compound of the following Chemical Formula
3, and a Grignard compound or an organolithium-based compound.
##STR00016##
[0180] In Chemical Formulae 1, 2, 3, 4, 5, 6, 7, and 12,
[0181] A, Y, R.sup.1 to R.sup.6, Q.sup.1, and Q.sup.2 are as
defined above.
[0182] More specifically, according to another preferred embodiment
of the present invention,
[0183] a method for preparing a compound of the following Chemical
Formula 1 is provided, including the steps of:
[0184] performing a Kumada coupling reaction of a compound of the
following Chemical Formula 8 with a compound of the following
Chemical Formula 9 in the presence of a catalyst to prepare a
compound of the following Chemical Formula 10;
[0185] reacting the compound of Chemical Formula 10 with a
ketone-based compound of the following Chemical Formula 11 in the
presence of an organolithium compound to prepare a compound of the
following Chemical Formula 12;
[0186] performing a Wolff-Kishner reaction of the compound of
Chemical Formula 12 with hydrazine to prepare a compound of the
following Chemical Formula 6;
[0187] reacting the compound of Formula 6 with a compound of the
following Chemical Formula 7 in the presence of an
organolithium-based compound to prepare a compound of the following
Chemical Formula 4;
[0188] reacting the compound of Formula 4 with a compound of the
following Chemical Formula 5 to prepare a ligand compound of the
following Chemical Formula 2; and
[0189] reacting the ligand compound of Chemical Formula 2 with an
organolithium-based compound and then reacting the resultant
reaction product with a compound of the following Chemical Formula
3, and a Grignard compound or an organolithium-based compound.
##STR00017## ##STR00018##
[0190] In Chemical Formulae 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and
12,
[0191] A, Y, R.sup.1 to R.sup.6, Q.sup.1, and Q.sup.2 are as
defined above,
[0192] Q.sup.3 is a halogen group or --OSO.sub.2CF.sub.3, Q.sup.4
is --MgQ.sup.3', wherein Q.sup.3' is the same as Q.sup.3 as defined
above, and
[0193] R'' and R''' are each independently a C1 to 06 alkyl
group.
[0194] The transition metal compound of Chemical Formula 1 can be
prepared with high purity and a high yield by the method as
described above.
[0195] In Chemical Formula 2, more preferred compounds for
controlling electronic and steric environments around the metal (M)
may be more specifically represented by one of the following
structural formulae.
##STR00019##
[0196] Catalyst Composition
[0197] In another embodiment of the present invention, a catalyst
composition including the aforementioned transition metal compound
is provided.
[0198] Specifically, the catalyst composition includes the
transition metal compound of Chemical Formula 1, and optionally,
may further include a co-catalyst capable of acting as a counter
ion, that is, an anion having weak bonding strength while
cationizing the central metal, preferably by extracting X1 and X2
ligands in the transition metal complex, so that the transition
metal compound of Chemical Formula 1 becomes an active catalyst
component used in the preparation of an ethylene homopolymer or a
copolymer of ethylene and alpha-olefin.
[0199] As an example, the co-catalyst may include any one or a
mixture of two or more selected from the group consisting of
compounds of the following Chemical Formulae 14 to 16.
A(R.sup.7).sub.3 [Chemical Formula 14]
[L-H].sup.+[W(D).sub.4].sup.- [Chemical Formula 15]
[L].sup.+[W(D).sub.4].sup.- [Chemical Formula 16]
[0200] In Chemical Formulae 14 to 16,
[0201] each of R.sup.7 is independently selected from the group
consisting of a halogen group, a hydrocarbyl group having 1 to 20
carbon atoms, and a hydrocarbyl group having 1 to 20 carbon atoms
substituted with a halogen group;
[0202] A is boron;
[0203] each D is independently an aryl group having 6 to 20 carbon
atoms or an alkyl group having 1 to 20 carbon atoms in which one or
more hydrogen atoms may be substituted with a substituent, the
substituent being at least any one selected from the group
consisting of a halogen, a hydrocarbyl group having 1 to 20 carbon
atoms, an alkoxy group having 1 to 20 carbon atoms, and an aryloxy
group having 6 to 20 carbon atoms;
[0204] H is a hydrogen atom;
[0205] L is a neutral or cationic Lewis acid; and
[0206] W is a group 13 element.
[0207] In the co-catalyst, the compounds of Chemical Formula 14
function as an alkylating agent for the transition metal compound,
and the compounds of Chemical Formulae 15 and 16 function as an
activating agent for the transition metal compound or the alkylated
transition metal compound.
[0208] As an example, the compound of Chemical Formula 14 may be
more specifically an alkylboron, wherein the alkyl group is as
defined above. More specifically, the compound of Chemical Formula
14 may include trimethylboron, triethyl boron, triisobutyl boron,
tripropyl boron, tributyl boron, and the like, and any one or a
mixture of two or more thereof may be used.
[0209] In addition, the compounds of Chemical Formulae 15 and 16
include a non-coordinative bonding anion compatible with a cation
that is a Bronsted acid, wherein the anion may contain a single
coordinative bonding complex compound having a relatively large
size and including metalloids. More specifically, the compounds of
Chemical Formulae 15 and 16 may each be a salt containing an anion
including a coordinative bonding complex compound containing a
single boron atom in the anion part.
[0210] Specific examples of such compounds may include trialkyl
ammonium salts such as trimethyl ammonium
tetrakis(pentafluorophenyl)borate, triethyl ammonium
tetrakis(pentafluorophenyl)borate, tripropyl ammonium
tetrakis(pentafluorophenyl)borate, tri(n-butyl)ammonium
tetrakis(pentafluorophenyl)borate, tri(2-butyl)ammonium
tetrakis(pentafluorophenyl)borate, N,N-dimethyl anilinium
tetrakis(pentafluorophenyl)borate, N,N-dimethyl anilinium
n-butyltris(pentafluorophenyl)borate, N,N-dimethyl anilinium
benzyltris(pentafluorophenyl)borate, N,N-dimethyl anilinium
tetrakis(4-(t-butyldimethylsilyl)-2,3,5,6-tetrafluorophenyl)borate,
N,N-dimethyl anilinium
tetrakis(4-triisopropylsilyl)-2,3,5,6-tetrafluorophenyl)borate,
N,N-dimethyl anilinium pentafluorophenoxy
tris(pentafluorophenyl)borate, N,N-diethyl anilinium
tetrakis(pentafluorophenyl)borate, N,N-dimethyl-2,4,6-trimethyl
anilinium tetrakis(pentafluorophenyl)borate, trimethyl ammonium
tetrakis(2,3,4,6-tetrafluorophenyl)borate, triethyl ammonium
tetrakis(2,3,4,6-tetrafluorophenyl)borate, tripropyl ammonium
tetrakis(2,3,4,6-tetrafluorophenyl)borate, tri(n-butyl)ammonium
tetrakis(2,3,4,6-tetrafluorophenyl)borate,
dimethyl(t-butyl)ammonium
tetrakis(2,3,4,6-tetrafluorophenyl)borate, N,N-dimethyl anilinium
tetrakis(2,3,4,6-tetrafluorophenyl)borate, N,N-diethylanilinium
tetrakis(2,3,4,6-tetrafluorophenyl)borate,
N,N-dimethyl-2,4,6-trimethyl anilinium
tetrakis(2,3,4,6-tetrafluorophenyl)borate, decyldimethyl ammonium
tetrakis(pentafluorophenyl)borate, dodecyldimethyl ammonium
tetrakis(pentafluorophenyl)borate, tetradecyldimethyl ammonium
tetrakis(pentafluorophenyl)borate, hexadecyldimethyl ammonium
tetrakis(pentafluorophenyl)borate, octadecyldimethyl ammonium
tetrakis(pentafluorophenyl)borate, eicosyldimethyl ammonium
tetrakis(pentafluorophenyl)borate, methyldidecyl ammonium
tetrakis(pentafluorophenyl)borate, methyldidodecyl ammonium
tetrakis(pentafluorophenyl)borate, methylditetradecyl ammonium
tetrakis(pentafluorophenyl)borate, methyldihexadecyl ammonium
tetrakis(pentafluorophenyl)borate, methyldioctadecyl ammonium
tetrakis(pentafluorophenyl)borate, methyldieicosyl ammonium
tetrakis(pentafluorophenyl)borate, tridecyl ammonium
tetrakis(pentafluorophenyl)borate, tridodecyl ammonium
tetrakis(pentafluorophenyl)borate, tritetradecyl ammonium
tetrakis(pentafluorophenyl)borate, trihexadecyl ammonium
tetrakis(pentafluorophenyl)borate, trioctadecyl ammonium
tetrakis(pentafluorophenyl)borate, trieicosyl ammonium
tetrakis(pentafluorophenyl)borate, decyldi(n-butyl)ammonium
tetrakis(pentafluorophenyl)borate, dodecyldi(n-butyl)ammonium
tetrakis(pentafluorophenyl)borate, octadecyldi(n-butyl)ammonium
tetrakis(pentafluorophenyl)borate, N,N-didodecyl anilinium
tetrakis(pentafluorophenyl)borate, N-methyl-N-dodecyl anilinium
tetrakis(pentafluorophenyl)borate, or methyldi(dodecyl)ammonium
tetrakis(pentafluorophenyl)borate; dialkyl ammonium salts such as
di-(i-propyl)ammonium tetrakis(pentafluorophenyl)borate or
dicyclohexyl ammonium tetrakis(pentafluorophenyl)borate; carbonium
salts such as tropylium tetrakis(pentafluorophenyl)borate,
triphenyl methylium tetrakis(pentafluorophenyl)borate, or
benzene(diazonium) tetrakis(pentafluorophenyl)borate, or the like,
and any one, or a mixture of two or more thereof, may be used. Even
more specifically, the compounds of Chemical Formulae 15 and 16 may
include N,N-dimethyl anilinium tetrakis(pentafluorophenyl)borate,
tributyl ammonium tetrakis(pentafluorophenyl)borate,
di(octadecyl)methyl ammonium tetrakis(pentafluorophenyl)borate,
di(octadecyl) (n-butyl)ammonium tetrakis(pentafluorophenyl)borate,
triphenyl methylium tetrakis(pentafluorophenyl)borate, tropylium
tetrakis(pentafluorophenyl)borate, or the like.
[0211] Solution polymerization is carried out in a solvent such as
hexane at an elevated temperature of about 150.degree. C. using
such a borate-based co-catalyst. If an aluminum-based co-catalyst
such as methylaluminoxane is used in place of the borate-based
co-catalyst, there is a disadvantage that the co-catalyst may be
precipitated in the form of a slurry and the aluminum-based
co-catalyst must be excessively added for conversion to an active
species.
[0212] Meanwhile, in the present invention, the borate-based
co-catalyst may be contained in an amount of 1.5 to 10 equivalents
based on the transition metal compound.
[0213] The transition metal compound of Chemical Formula 1 and the
co-catalyst may be used in a form supported on a carrier. In this
case, an inorganic carrier such as silica or alumina may be used as
the carrier. Using in a form supported on an inorganic carrier as
above may be useful for slurry polymerization or gas-phase
polymerization in the polymerization for preparing an olefin-based
polymer thereafter.
[0214] As an example, the catalyst composition having compositions
as above may be prepared in accordance with conventional methods,
and specifically, may be prepared by a preparation method (first
method) including obtaining a mixture by bringing the transition
metal compound of Chemical Formula 1 into contact with the
alkylating agent of Chemical Formula 14, and adding the activating
agent of Chemical Formula 15 or 16 to the mixture, or may be
prepared by a preparation method (second method) including bringing
the transition metal compound of Chemical Formula 1 into contact
with the activating agent of Chemical Formula 15 or 16.
[0215] In the first method, a molar ratio of the alkylating agent
of Chemical Formula 14 relative to the transition metal compound of
Chemical Formula 1 may be from 1:2 to 1:5000, more specifically
from 1:10 to 1:1,000, and even more specifically from 1:20 to
1:500. In addition, a molar ratio of the activating agent of
Chemical Formula 15 or 16 relative to the transition metal compound
of Chemical Formula 1 may be form 1:1 to 1:25, more specifically
from 1:1 to 1:10, and even more specifically from 1:1 to 1:5. When
a molar ratio of the alkylating agent of Chemical Formula 14
relative to the transition metal compound of Chemical Formula 1 is
less than 1:2, the amount of the alkylating agent is excessively
small, which may lead to concern of the transition metal compound
alkylation not being sufficiently progressed, and when the molar
ratio is greater than 1:5000, activation of the alkylated
transition metal compound may be difficult due to a side reaction
between the excess alkylating agent and the activating agent of
Chemical Formula 15 or 16 added afterward. In addition, when a
molar ratio of the activating agent of Chemical Formula 15 or 16
relative to the transition metal compound of Chemical Formula 1 is
less than 1:1, the amount of the activating agent is relatively
small causing insufficient activation of the transition metal
compound, which may lead to concern of greatly reducing activity of
the produced catalyst composition, and when the molar ratio is
greater than 1:25, it may cause concern of cost increases in
preparing the catalyst composition due to excessive use of the
activating agent, and decrease in the purity of the produced
polymer.
[0216] In the second method, a molar ratio of the activating agent
of Chemical Formula 15 or 16 relative to the transition metal
compound of Chemical Formula 1 may be from 1:1 to 1:500, more
specifically from 1:1 to 1:50, and even more specifically from 1:2
to 1:25. When the molar ratio is less than 1:1, the amount of the
activating agent is relatively small causing incomplete activation
of the transition metal compound, which may lead to concern of
reducing activity of the produced catalyst composition, and when
the molar ratio is greater than 1:500, it may cause concern of cost
increases in preparing the catalyst composition due to excessive
use of the activating agent, and decrease in the purity of the
produced polymer.
[0217] Meanwhile, in the preparation of the catalyst composition,
aliphatic hydrocarbon-based solvents such as pentane, hexane, or
heptane, or aromatic-based solvents such as benzene or toluene, may
be used as a reaction solvent, however, the solvent is not limited
thereto, and all solvents capable of being used in the art may be
used.
[0218] As described above, the catalyst composition according to
one embodiment of the present invention includes the transition
metal compound of Chemical Formula 1 having excellent structural
stability as well as being structurally very facilitating of
monomer approaches, and thereby may exhibit excellent
polymerization reactivity, and particularly, may exhibit excellent
reactivity for olefin monomers having large steric hindrance.
[0219] In addition, by including the co-catalyst as above together
with the transition metal compound, the co-catalyst activates the
transition metal compound to an appropriate degree and suppresses
the production of excessively long polymer chains in the
preparation of an olefin-based polymer, while the transition metal
compound and the co-catalyst randomize bonding of olefin-based
monomers, and thereby, an olefin-based polymer having a low
crystallization temperature and melting temperature as well as
having low density may be prepared.
[0220] Meanwhile, the catalyst composition of the present invention
includes the transition metal compound of Chemical Formula 1 and
can exhibit excellent catalytic activity. Specifically, the
catalytic activity represented by the total yield of the produced
olefin polymer (kgpolyolefin/mmoltransition metal compound)
relative to the molar ratio of the transition metal compound added
may be about 3.5 kg/mmol or more, about 3.5 to 50 kg/mmol, about
4.0 kg/mmol or more, about 4.0 to 50 kg/mmol, about 4.5 kg/mmol or
more, or about 4.5 to 50 kg/mmol.
[0221] The catalyst composition is capable of being used in various
fields, and among these, may be useful in preparing an olefin-based
polymer, particularly, in preparing a low density ethylene polymer
or a copolymer of ethylene and alpha-olefin.
[0222] Olefin-Based Polymer
[0223] Another embodiment of the present invention provides an
olefin-based polymer prepared using the aforementioned catalyst
composition.
[0224] The olefin-based polymer may be prepared in accordance with
conventional methods for preparing an olefin-based polymer except
that the catalyst composition is used. Specifically, the
olefin-based polymer can be prepared by bringing the aforementioned
catalyst composition into contact with one or more olefin monomers
to perform polymerization reaction, and thereby, may be prepared
into an olefin-based homopolymer or copolymer. Specifically, the
olefin-based polymer may be polyethylene, and particularly, may be
an ethylene homopolymer, or a copolymer of ethylene and
alpha-olefin.
[0225] The polymerization for the preparation of the olefin-based
polymer may be carried out in accordance with various methods such
as slurry polymerization, liquid-phase polymerization, gas-phase
polymerization, or bulk polymerization, and more specifically, may
be carried out through liquid-phase polymerization.
[0226] When the polymerization is carried out through liquid-phase
polymerization, olefin monomers may be dissolved or diluted in a
solvent for polymerization such as an aliphatic hydrocarbon solvent
having 5 to 12 carbon atoms (e.g., pentane, hexane, heptane,
nonane, decane, isomers thereof, or the like), an aromatic
hydrocarbon solvent having 6 to 20 carbon atoms (e.g., toluene,
benzene, or the like), or a chlorinated hydrocarbon-based solvent
(e.g., dichloromethane, chlorobenzene, or the like) to be used. In
this case, small amounts of water, air, or the like acting as
catalyst poisons for the solvent for polymerization may be removed
using an alkyl aluminum.
[0227] In addition, specific examples of the monomer for preparing
the olefin-based polymer may include ethylene, alpha-olefin, cyclic
olefin, or the like, and diene olefin-based monomers or triene
olefin-based monomers having two or more double bonds, and the
like, may also be used. More specifically, examples of the
olefin-based monomer may include ethylene, propylene, 1-butene,
1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene,
1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene,
1-eicosene, norbornene, norbornadiene, ethylidene norbornene,
phenyl norbornene, vinyl norbornene, dicyclopentadiene,
1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene,
alpha-methylstyrene, divinylbenzene, 3-chloromethylstyrene,
2,3-diisopropenylidene-5-norbornene,
2-ethylidene-3-isopropylidene-5-norbornene,
2-propenyl-2,5-norbornadiene, 1,3,7-octatriene, 1,4,9-decatriene,
or the like, and any one, or a mixture of two or more thereof, may
be used.
[0228] Further, when preparing a copolymer of ethylene and
.alpha.-olefin as the olefin-based polymer, an .alpha.-olefin
having 3 to 18 carbon atoms may be used as a co-monomer together
with ethylene. Specifically, the .alpha.-olefin may include
propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene,
1-octene, 1-decene, 1-dodecene, 1-hexadecene, 1-octadecene, or the
like, and any one, or a mixture of two or more thereof, may be
used. More specifically, 1-butene, 1-hexene, 1-octene, or 1-decene
may be used.
[0229] Further, when preparing the copolymer, the .alpha.-olefin
may be used in an amount such that the content of ethylene in the
finally prepared copolymer is 50% by weight or more, more
specifically 60% by weight or more, and even more specifically from
60% to 99% by weight.
[0230] Further, a process for preparing the olefin polymer may be
carried out at 20.degree. C. to 500.degree. C., more specifically
at 25.degree. C. to 200.degree. C., and even more specifically at
50.degree. C. to 100.degree. C. Herein, the reaction pressure may
be from 0.1 to 7 bar, and more specifically from 1 to 5 bar.
[0231] The polymer prepared using the preparation method as above
has high molecular weight and low density by using the catalyst
composition including the transition metal compound of Chemical
Formula 1.
[0232] In particular, the olefin polymer according to the present
invention is characterized by being excellent in copolymerizability
and molecular weight, and having a higher molecular weight even at
the same density. Specifically, the polymer may have a low density
of 0.91 g/cc or less, 0.860 to 0.910 g/cc, 0.89 g/cc or less, 0.865
to 0.890 g/cc, 0.886 g/cc or less, or 0.868 to 0.886 g/cc. At the
same time, the polymer may have a melt index (MI) at a load of 2.16
kg of 1.5 g/10 min or less, 0.01 to 1.5 g/10 min, 1.0 g/10 min or
less, 0.03 to 1.0 g/10 min, 0.9 g/10 min or less, or 0.05 to 0.9
g/10 min.
[0233] As described above, the olefin polymer of the present
invention can exhibit excellent mechanical properties such as
rigidity and impact resistance by having low density and high
molecular weight properties. In the present invention, the melt
index may be measured in accordance with the ASTM D-1238 (condition
E, 190.degree. C., load of 2.16 kg). As described above, according
to the present invention, it is possible to prepare a high
molecular weight polymer having a low density of about 0.91 g/cc or
less but having a melt index (MI) of 1.5 g/10 min or less, a high
molecular weight polymer having a low density of about 0.89 g/cc or
less but having a melt index (MI) of 1 g/10 min or less, or having
a low density of about 0.886 g/cc or less but having a melt index
(MI) of 0.9 g/10 min or less.
[0234] The polymer may have a molecular weight distribution (MWD)
of 1.8 to 2.5 and a weight average molecular weight (Mw) of 100,000
to 200,000.
[0235] Further, in addition to the low density and high molecular
weight properties, the polymer may have a crystallization
temperature (T.sub.c) of 78.0.degree. C. or lower, 30 to
78.0.degree. C., 65.degree. C. or lower, 35 to 65.degree. C.,
63.degree. C. or lower, or 35 to 63.degree. C.; and a melting
temperature (T.sub.m) of 115.0.degree. C. or less, 50 to
115.0.degree. C., 80.degree. C. or less, 55 to 80.degree. C.,
78.degree. C. or lower, or 55 to 78.degree. C. By having a lower
crystallization temperature and melting temperature compared to
existing olefin-based polymers, superior processability may be
obtained.
[0236] In the present invention, the crystallization temperature
(T.sub.c) and melting temperature (T.sub.m) may be measured using a
differential scanning calorimeter (DSC) 2920 manufactured by TA
Instruments. In this case, the measured values are obtained through
second melt raising the temperature by 10.degree. C. per minute in
order to remove thermal history of the polymer. In the measured DSC
curve, T.sub.c is a maximum point of the exothermic peak in the
cooling, and Tm is a maximum point of the endothermic peak in the
second temperature raising.
[0237] The olefin-based polymer having physical properties as above
may be used in various fields and applications such as for
automobiles, for wires, for toys, for fibers, for medicines, for
construction, or for consumer goods.
[0238] Hereinafter, preferred examples will be provided to assist
the understanding of the present invention. However, the following
examples are for illustrative purposes only and are not intended to
limit the scope of the present invention.
EXAMPLES
[0239] <Preparation of Transition Metal Compound>
[0240] Organic reagents and solvents were purchased from Aldrich
and purified by standard methods to be used unless particularly
mentioned otherwise.
[0241] Contact with air and moisture was blocked in all synthesis
steps to thereby enhance the reproducibility of experiments.
Preparation Example 1
[0242] A ligand compound (2a) and a transition metal compound (1a)
were prepared through the same processes as in the following
Reaction Scheme 7.
##STR00020## ##STR00021##
[0243] In Reaction Scheme 7, R is a methyl group.
[0244] Step 1) Preparation of Ligand Compound (2a)
##STR00022##
[0245] 3-bromothianaphthene (7a) (10 g, 46.9 mmol) and
p-tolylmagnesium bromide (1.2 eq., 56.3 mmol) were reacted in the
presence of NdpppCl.sub.2 ([1,3-bis
(diphenylphosphino)propane]dichloronickel(II), 2 mol %, 508 g, 0.94
mmol) to prepare the compound of Chemical Formula 9a. Here,
equivalent (eq.) refers to molar equivalent (eq./mol).
[0246] Then, the prepared compound of Chemical Formula 9a was
reacted with the compound of Chemical Formula 10a (1.0 eq., 55.4
mmol) in tetramethylethylenediamine (TMEDA, 2.2 eq. 122 mmol) in
the presence of n-butyllithium (n-BuLi, C.sub.4H.sub.9Li, 2.2 eq.,
122 mmol) to prepare the compound of Chemical Formula 11a.
[0247] The prepared compound of Chemical Formula 11a was reacted
with hydrazine (5.3 eq., 101 mmol) at 80.degree. C. for 1 hour and
under reflux in diethylene glycol solvent to prepare the compound
of Chemical Formula 5a. Then, n-BuLi (1.05 eq.) and SiMeCl.sub.2
(3.0 eq.) were added and reacted to prepare the compound of
Chemical Formula 3a.
[0248] The prepared compound of Chemical Formula 3a was reacted
with t-BuNH.sub.2 (8.0 eq.) to obtain a ligand compound of Chemical
Formula 2a.
[0249] Compound 9a: .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. 2.159 (s, 3H), 6.987-7.134 (m, 4H), 7.332-7.347 (d,
2H), 7.608-7.623 (d, 1H), 7.883-7.898 (d, 1H).
[0250] Compound 10a: .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. 1.898 (s, 3H), 6.731-6.748 (d, 1H), 6.863-6.877 (d,
1H), 6.910-6.943 (t, 1H), 7.022-7.054 (t, 1H), 7.205-7.236 (dd,
2H), 7.581-7.597 (d, 1H).
[0251] Compound 5a: .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. 2.250 (s, 3H), 3.365 (s, 2H), 6.943 (s, 1H),
7.093-7.124 (t, 2H), 7.247-7.277 (t, 1H), 7.618-7.658 (dd, 2H),
8.016-8.032 (d, 1H).
[0252] Compound 3a: .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. -0.020 (s, 3H), 0.028 (s, 3H), 2.293 (s, 3H), 3.772
(s, 1H), 7.093-7.134 (m, 2H), 7.249-7.279 (t, 1H), 7.410 (s, 1H),
7.606-7.622 (d, 1H), 7.738-7.754 (d, 1H), 8.041-8.057 (d, 1H)
[0253] Compound 2a: .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. -0.0281 (s, 3H), 0.154 (s, 3H), 1.110 (s, 9H), 2.390
(s, 3H), 3.363 (s, 1H), 7.246-7.313 (m, 2H), 7.417 (s, 1H),
7.619-7.661 (dd, 1H), 7.703-7.719 (d, 1H), 7.841-7.857 (d, 1H),
8.123-8.139 (d, 1H).
[0254] Step 2) Preparation of Ligand Compound (1a)
##STR00023##
[0255] The ligand compound (2a) (1.68 g, 4.6 mmol) prepared in step
1 and 15 mL of methyl(tert-butyl)ether (MTBE) were added to a 100
mL Schlenk flask, and the mixture was first stirred. BuLi (9.43 mL,
2.05 eq., concentration in hexane: 2.5 M) was added thereto at
-30.degree. C. and reacted overnight at room temperature
(20.+-.5.degree. C.). Then, methylmagnesium bromide (MeMgBr, 3.8
mL, 2.5 eq., concentration in diethyl ether: 3.0 M) was slowly
added dropwise at -30.degree. C., and TiCl.sub.4 (4.6 mL, 1.0 eq.,
concentration in toluene: 1.0 M) was sequentially added and reacted
overnight at room temperature (20.+-.5.degree. C.). Then, the
reaction mixture was filtered through Celite using hexane. The
solvent was dried to obtain a transition metal compound (1a) as a
brown solid having the above chemical structure.
[0256] .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15 ppm): .delta.
0.053 (s, 3H), 0.167 (s, 3H), 0.683 (s, 3H), 0.721 (s, 3H), 1.428
(S, 9H), 2.166 (s, 3H, aromatic-Me), 7.123-7.013 (m, 3H, aromatic),
7.248 (t, 1H), 7.457 (s, 1H, aromatic), 7.876-7.859 (d, 1H),
7.939-7.923 (d, 1H, aromatic).
Preparation Example 2
[0257] Step 1) Preparation of Ligand Compound (2b)
##STR00024##
[0258] A ligand compound (2b) having the above structure was
prepared in the same manner as in step 1 of Preparation Example 1,
except that 4-isopropylphenylmagnesium bromide (1.2 eq.) was used
instead of p-tolylmagnesium bromide.
[0259] .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15 ppm): .delta.
-0.236 (s, 3H), 0.151 (s, 3H), 1.105 (s, 9H), 1.241-1.255 (d, 3H),
1.331-1.349 (s, 3H), 2.941-2.996 (m, 1H), 3.822 (s, 1H),
7.099-7.136 (m, 1H), 7.254-7.269 (d, 1H), 7.293-7.322 (t, 1H),
7.533 (s, 1H), 7.691-7.720 (t, 1H), 7.877-7.893 (d, 1H),
8.151-8.167 (d, 1H).
[0260] Step 2) Preparation of Transition Metal Compound (1b)
##STR00025##
[0261] A transition metal compound (1 b) was prepared in the same
manner as in step 2 of Preparation Example 1, except that a ligand
compound (2b) (738 mg, 1.87 mmol) prepared in step 1 was used.
[0262] .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15 ppm): .delta.
0.023 (s, 3H), 0.174 (s, 3H), 0.706 (s, 3H), 0.731 (s, 3H),
1.196-1.183 (d, 6H), 1.427 (S, 9H), 2.777-2.749 (m, 1H),
7.047-7.031 (t, 1H, aromatic), 7.256-7.205 (m, 3H), 7.538 (s, 1H,
aromatic), 7.924-7.907 (d, 1H), 7.971-7.955 (d, 1H, aromatic).
Preparation Example 3
[0263] Step 1) Preparation of Ligand Compound (2c)
##STR00026##
[0264] A ligand compound (2c) was prepared in the same manner as in
step 1 of Preparation Example 1, except that
4-t-butylphenylmagnesium bromide (1.2 eq.) was used instead of
p-tolyl magnesium bromide.
[0265] .sup.1H NMR (500 MHz, CDCl.sub.3, 7.26 ppm): .delta. -0.245
(s, 3H), 0.150 (s, 3H), 1.278 (s, 9H), 1.405 (s, 9H), 2.358 (s,
1H), 4.005 (s, 1H), 7.32 (t, 1H), 7.40 (d, 1H), 7.46 (t, 1H), 7.65
(s, 1H), 7.82 (d, 1H), 7.87 (d, 1H), 8.16 (d, 1H).
[0266] Step 2) Preparation of Transition Metal Compound (1c)
##STR00027##
[0267] The ligand compound (2c) (278.7 mg, 0.684 mmol) prepared in
step 1 and 4 mL of MTBE were added to a 100 mL Schlenk flask, and
the mixture was first stirred. BuLi (0.56 mL, 2.05 eq.,
concentration in hexane: 2.5 M) was added thereto at -78.degree. C.
and reacted overnight at room temperature (20.+-.5.degree. C.).
Then, MeMgBr (0.57 mL, 2.5 eq., concentration in diethyl ether: 3.0
M) was slowly added dropwise at -78.degree. C., and TiCl.sub.4
(0.684 mL, 1 eq., concentration in toluene: 1.0 M) was sequentially
added and reacted overnight at room temperature (20.+-.5.degree.
C.). Then, the reaction mixture was filtered through Celite using
hexane. The solvent was dried to obtain 260 mg of a transition
metal compound (1c) as a brown solid having the above chemical
structure (78.3%).
[0268] .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15 ppm): .delta.
-0.014 (s, 3H), 0.168 (s, 3H), 0.730 (d, 3H), 1.039 (s, 3H), 1.277
(s, 9H), 1.429 (s, 9H), 7.051 (m, 3H), 7.265 (t, 1H), 7.439 (t,
3H), 7.687 (s, 1H), 7.920 (d, 1H), 7.996 (d, 1H).
Comparative Preparation Example 1
[0269] A transition metal compound (I) was prepared in the same
manner as in step 2 of Preparation Example 1, except that the
ligand compound (i) (0.36 g, 0.993 mmol) having the following
structure was used.
##STR00028##
[0270] .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15 ppm): .delta.
-0.058 (s, 3H), 0.081 (s, 3H), 0.572 (s, 3H), 0.806 (s, 3H), 1.427
(s, 9H), 2.229 (s, 3H), 3.118 (s, 3H N-Me), 6.907-6.985 (d, 1H,
aromatic), 7.288-7.257 (m, 2H), 7.641 (s, 1H, aromatic),
7.888-7.863 (d, 1H), 7.915-7.900 (d, 1H, aromatic).
Comparative Preparation Example 2
##STR00029##
[0272] A transition metal compound (II) was prepared in the same
manner as in step 2 of Preparation Example 1, except that the
ligand compound (ii) (0.47 g, 1.349 mmol) having the above
structure was used.
[0273] .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15 ppm): .delta.
-0.144 (s, 3H), 0.048 (s, 3H), 0.514 (s, 3H), 0.748 (s, 3H),
1.170-1.151 (dd, 6H), 2.221 (s, 3H), 3.104 (s, 3H N-Me),
4.800-4.775 (m, 1H), 7.012-6.997 (d, 1H, aromatic), 7.278-7.264 (m,
2H), 7.617 (s, 1H, aromatic), 7.936-7.930 (d, 1H), 7.919-7.913 (d,
1H, aromatic).
Comparative Preparation Example 3
##STR00030##
[0275] A transition metal compound having the above structure was
synthesized with reference to Korean Patent No. 10-1637982.
[0276] In detail, a ligand compound (iii) (1.06 g, 3.22 mmol/1.0
eq.) having the above structure and 16.0 mL (0.2 M) of MTBE were
added to a 50 mL Schlenk flask, and the mixture was first stirred.
BuLi (2.64 mL, 6.60 mmol/2.05 eq., 2.5 M in THF) was added thereto
at -40.degree. C. and reacted overnight at room temperature. Then,
MeMgBr (2.68 mL, 8.05 mmol/2.5 eq., 3.0 M in diethyl ether) was
slowly added dropwise at -40.degree. C., and then TiCl.sub.4 (2.68
mL, 3.22 mmol/1.0 eq., 1.0 M in toluene) was sequentially added and
reacted overnight at room temperature. Then, the reaction mixture
was filtered through Celite using hexane. After drying the solvent,
1.07 g of brown solid was obtained in a yield of 82%.
[0277] .sup.1H-NMR (in CDCl.sub.3, 500 MHz): .delta. 7.99 (d, 1H),
7.68 (d, 1H), 7.40 (dd, 1H), 7.30 (dd, 1H), 3.22 (s, 1H), 2.67 (s,
3H), 2.05 (s, 3H), 1.54 (s, 9H, 0.58 (s, 3H), 0.57 (s, 3H), 0.40
(s, 3H), 0.45 (s, 3H).
Comparative Preparation Example 4
##STR00031##
[0279] A transition metal compound (IV) was prepared in the same
manner as in step 2 of Preparation Example 1, except that the
ligand compound (iv) (0.47 g, 1.349 mmol) having the above
structure was used.
[0280] Compound (iv) .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. -0.405 (s, 3H), 0.096 (s, 3H), 1.179 (s, 9H), 3.925
(s, 3H), 3.363 (s, 1H), 7.095-7.110 (m, 2H), 7.206-7.236 (t, 1H),
7.253-7.283 (t, 1H), 7.345-7.375 (t, 1H), 7.478-7.494 (d, 1H),
7.767-7.783 (d, 1H), 7.805-7.820 (d, 1H), 8.070-8.086 (d, 1H).
[0281] Compound (IV) .sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. 0.014 (s, 3H), 0.152 (s, 3H), 0.614 (s, 9H), 0.700
(s, 3H), 1.413 (s, 9H), 6.977-7.008 (t, 1H), 7.028-7.061 (t, 1H),
7.195-7.259 (m, 3H), 7.422-7.437 (d, 1H), 7.569-7.586 (d, 1H),
7.897-7.936 (dd, 2H).
Comparative Preparation Example 5
##STR00032##
[0283] A transition metal compound (V) was prepared in the same
manner as in step 2 of Preparation Example 1, except that the
ligand compound (v) (0.47 g, 1.349 mmol) having the above structure
was used.
[0284] Compound (V).sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15 ppm):
.delta. 0.029 (s, 3H), 0.140 (s, 3H), 0.676 (s, 3H), 0.711 (s, 3H),
1.423 (S, 9H), 2.103 (s, 3H, aromatic-Me), 2.164 (s, 3H,
aromatic-Me), 7.105-6.994 (m, 2H, aromatic), 7.265-7.23 (t, 1H),
7.433 (d, 1H, aromatic), 7.866-7.849 (d, 1H), 7.932-7.917 (d, 1H,
aromatic).
Comparative Preparation Example 6
##STR00033##
[0286] A transition metal compound (VI) was prepared in the same
manner as in step 2 of Preparation Example 1, except that the
ligand compound (vi) (0.47 g, 1.349 mmol) having the above
structure was used.
[0287] Compound (VI).sup.1H NMR (500 MHz, C.sub.6D.sub.6, 7.15
ppm): .delta. 0.029 (s, 3H), 0.140 (s, 3H), 0.676 (s, 3H), 0.711
(s, 3H), 1.423 (S, 9H), 2.103 (s, 3H, aromatic-Me), 7.105-6.994 (m,
3H, aromatic), 7.265-7.23 (t, 1H), 7.433 (d, 1H, aromatic),
7.8.
Preparation of Olefin Copolymer
Example 1: Preparation of Ethylene/1-octene Copolymer
[0288] A hexane (1.0 L, Daesan, purified) solvent and 240 ml of
1-octene (81%) were added to a 2 L autoclave reactor, and the
reactor temperature was heated to 150.degree. C. At the same time,
the inside of the reactor was saturated with ethylene at about 35
bar. A catalyst-injection cylinder was filled with 3 .mu.mol of the
transition metal compound (1a) of Preparation Example 1 treated
with 0.6 mmol of triisobutyl aluminum (TIBAL, 1.0 M), and 9 .mu.mol
(3 equivalents) of a dimethyl anilinium
tetrakis(pentafluorophenyl)borate (AB) co-catalyst, and the result
was injected into the reactor. Herein, the copolymerization
reaction was carried out for 8 minutes while constantly injecting
ethylene so as to maintain the pressure inside the reactor at about
35 bar.
[0289] After completion of the polymerization reaction, the
remaining ethylene gas was withdrawn, and the polymer solution was
added to an excess amount of ethanol to induce precipitation. The
obtained polymer was washed two or three times each with ethanol
and acetone, and dried in a vacuum oven at 80.degree. C. for 12
hours or more.
Examples 2 and 3: Preparation of Ethylene/1-octene Copolymer
[0290] Copolymerization was carried out in the same manner as in
Example 1, except that each of the transition metal compounds (1 b
and 1c) prepared in Preparation Examples 2 and 3 was used instead
of the transition metal compound prepared in Preparation Example 1,
and the content of 1-octene was changed as shown in Table 1
below.
Comparative Examples 1 to 6: Preparation of Ethylene/1-octene
Copolymer
[0291] Copolymerization was carried out in the same manner as in
Example 1 except that each of the transition metal compounds (I,
II, III, IV, V, and VI) prepared in Comparative Preparation
Examples 1 to 5 was used instead of the transition metal compound
(1a) prepared in Preparation Example 1, and the content of 1-octene
was changed as shown in Table 1 below.
Comparative Example 7: Preparation of Ethylene/1-octene
Copolymer
[0292] Copolymerization was carried out in the same manner as in
Example 1, except that the transition metal compound having the
following structure was used instead of the transition metal
compound prepared in Preparation Example 1, and the content of
1-octene was changed to 160 mL. At this time, the following
transition metal compound (X) was prepared in accordance with the
method described in [2007 Organometallics 26, 6686-6687].
##STR00034##
[0293] .sup.1H NMR (C.sub.6D.sub.6): .delta. 7.00 (d, J=7.2 Hz, 1H,
Ph-H), 6.92 (d, J=7.2 Hz, 1H, Ph-H), 6.84 (t, J=7.6 Hz, 1H, Ph-H),
4.58-4.50 (m, 2H, NCH.sub.2), 2.47 (t, J=6.4 Hz, 2H, CH.sub.2),
2.05 (s, 6H, Cp-CH.sub.3), 1.74-1.58 (m, 2H, CH.sub.2), 1.66 (s,
6H, Cp-CH.sub.3), 0.58 (s, 6H, TiCH.sub.3) ppm.
Evaluation of Physical Properties of Olefin Copolymer
Test Example 1: Physical Property Evaluation
[0294] Yield and catalytic activity in the preparation of the
ethylene/1-octene copolymers according to examples and comparative
examples, and a melt index (MI), a density, a crystallization
temperature (T.sub.c), and a melting temperature (T.sub.m) of the
prepared copolymers were each measured using methods as follows,
and the results are shown in Table 1 below.
[0295] (1) Yield (g): The obtained polymer was vacuum dried and the
yield was measured.
[0296] (2) Catalytic activity: determined from a molar ratio of the
transition metal compound based on the total amount of the obtained
copolymer prepared. In detail, a ratio of the value obtained from
measuring a mass of some of the reaction solution taken after the
completion of the polymerization reaction, and the value obtained
from measuring a mass of the copolymer remaining after removing all
the hexane solvent and residual monomers by heating some of the
copolymer for 10 minutes at 120.degree. C. was calculated, and,
based thereon, catalytic activity was calculated using the mass of
the copolymer produced, the molar number of the transition metal
compound used in the polymerization reaction, and the
polymerization time.
[0297] (3) Melt index (MI): measured in accordance with ASTM D-1238
(condition E, 190.degree. C., load of 2.16 kg).
[0298] (4) Density: the sample treated with an antioxidant (1000
ppm) was prepared to a sheet having a thickness of 3 mm and a
radius of 2 cm using a 180.degree. C. press mold, cooled by
10.degree. C./min, and measured in a Mettler balance.
[0299] (5) Crystallization temperature (T.sub.c) and melting
temperature (T.sub.m): measured using a differential scanning
calorimeter (DSC) 2920 manufactured by TA Instruments. In detail,
using DSC, the temperature of the copolymer was raised to
200.degree. C. under a nitrogen atmosphere, maintained for 5
minutes, and then lowered to 30.degree. C., and then raised again
to observe a DSC curve. Herein, the heating rate and the cooling
rate were each 10.degree. C./min. In the measured DSC curve, the
crystallization temperature was a maximum point of the exothermic
peak in the cooling, and the melting temperature was a maximum
point of the endothermic peak in the second temperature
raising.
TABLE-US-00001 TABLE 1 Content of Amount Type of transition of 1-
atalytic transition metal octene activity metal compound added
Yield (kgPE/ Density MI Tc Tm compound (.mu.mol) (mL) (g) mmol)
(g/cc) (g/10 min) (.degree. C.) (.degree. C.) Example 1 1a 3 240
18.3 6.1 0.872 0.9 40.9/72.2 60.3/(115.0) Example 2 1b 3 140 13.7
4.6 0.886 0.05 .sup. 62.3/(78.0) 77.7/(110.6) Example 3 1c 3 240
17.2 5.7 0.876 0.3 .sup. 58.3/(73.0) 72.5/(111).sup. Comparative I
3 330 8.6 2.9 0.876 0.6 50.0/58.4 65.8 Example 1 Comparative II 3
190 1.9 0.6 0.889 Not 28.0/(64.7)/ 117.8 Example 2 measurable 102.9
Comparative III 3 310 30 10 0.871 2.7 43.5/70.3 59.9/(66.8) Example
3 Comparative IV 3 240 14.2 4.7 0.871 1.1 39.3/71.4 59.0/(112.8)
Example 4 Comparative V 3 240 9 3.0 0.889 Not 30 118 Example 5
measurable Comparative VI 3 240 10 3.3 0.887 Not 28 117 Example 6
measurable Comparative X 3 160 45.1 15.0 0.873 3.3 45.6 61.4
Example 7 <Polymerization condition> Ethylene (C2): 35 bar,
Octene (C8): 81%, Hexane: Daesan (prepared by purification),
Temperature.: 150.degree. C. (8 min), Catalyst: 3 .mu.mol,
Cocatayst: dimethyl anilinium tetrakis(pentafluorophenyl)borate
(AB) 9 .mu.mol (3 eq.), Scavenger: triisobutyl aluminum (TIBAL, 0.6
mmol)
[0300] As shown in Table 1, the ethylene-octene copolymers of
Examples 1 to 3 prepared using the catalyst composition containing
the transition metal compound according to the present invention
exhibited lower density, MI, T.sub.c, and T.sub.m even when a lower
amount of comonomer was added, compared with the copolymers of
Comparative Examples 1 to 7. In particular, the copolymers of
Examples 1 to 3 exhibited a low MI of less than 1 g/10 min together
with a low density of 0.89 g/cc or less. Consequently, the
transition metal compounds of Examples 1 to 3 according to the
present invention had a substituted indeno-fused benzothiophene
ligand structure, and could control electronic and steric
environments around the metal, thereby exhibiting superior
catalytic activity and copolymerizability. As a result, low density
and high molecular weight olefin polymers were prepared.
[0301] In particular, in the case of Examples 1 to 3, a polymer
having a low density could be prepared with a small amount of
comonomer as compared with Comparative Examples 1 to 3. More
specifically, in the case of Example 1, 240 mL of octene was
required in the preparation of a polymer having a density of 0.872
g/cc, but in the case of Comparative Example 1, even when 330 ml of
octene was used, a polymer having a density of 0.876 g/cc was
prepared, that is, even when a higher amount of 1-octene was used,
a polymer having a relatively high density was merely prepared. In
addition, it can be confirmed that in the case of Comparative
Example 1, the yield was less than half of that of Example 1, and
the catalytic activity was also remarkably lowered. Further, even
in the case of Comparative Example 3, 310 mL of 1-octene was used
to prepare a polymer having a density of 0.871 g/cc. Accordingly,
it can be seen that, in the case of Examples 1 to 3 according to
the present invention, a low density polymer having a lower density
could be prepared even by using a small amount of comonomer. In
addition, the catalyst activity of Examples 1 to 3 was found to be
superior at over 4.6 kgPE/mmolcat, whereas in the case of
Comparative Example 1, the catalyst activity was found to be only
2.9 kgPE/mmolcat. Thus, in Comparative Example 1, although a
considerable amount of comonomer (octene) was added, it was
difficult to use it as a catalyst for producing elastomer products
because the density was low and the catalyst activity was
remarkably low. Further, in general, it was difficult to produce a
polymer having a higher molecular weight as the polymer had a lower
density, but in the case of Examples 1 to 3, a high molecular
weight polymer having an MI of 0.9 g/10 min or less while having a
low density could be produced. As a result, a polymer having
excellent impact strength and elongation could be secured.
[0302] Furthermore, in the case of Comparative Example 3 prepared
using the catalyst composition containing a transition metal
compound (III) having a ligand structure fused with cyclopentadiene
and benzothiophene, the copolymerization property with 1-octene was
remarkably low, and thus a copolymer having the same level of
density as that of Examples 1 to 3 was produced when 310 mL of
1-octene had to be excessively added during polymerization.
However, the prepared copolymer was a low molecular weight
copolymer having a high MI of 2.7.
[0303] Further, in the case of Comparative Example 4 prepared using
the catalyst composition including the transition metal compound
(IV) having an unsubstituted indeno-fused benzothiophene ligand
structure, the yield was lowered due to the low catalytic activity
as compared with Example 1, and the prepared copolymer exhibited
the same level of density as that of Example 1, but it was a lower
molecular weight copolymer having a higher MI. In the case of
Comparative Examples 5 and 6, a transition metal compound having a
structure similar to that of Example 1 was applied, but the yield
was reduced due to low catalytic activity, and a low molecular
weight copolymer was prepared in which MI was too high to measure
at all. As seen in Comparative Example 6, it exhibited the same
level of density as that of Example 1, but a low molecular weight
copolymer having a high MI of 3.3 was prepared. It can be seen
that, in Comparative Examples 5 and 6, the catalyst activity was
remarkably low, the molecular weight was low, and the
copolymerization property was remarkably lowered.
[0304] As described above, in the transition metal compounds
according to the present invention, a transition metal as a central
metal may form the specific rigid pentagonal ring structure with an
amino group substituted with a silyl group. Therefore, the
transition metal compound is capable of exhibiting excellent
structural stability together with excellent polymerization
reactivity by maintaining a pentagonal ring structure. Since
approaches of monomers having large steric hindrance such as
1-ocatene are more facilitated structurally, the transition metal
compound is particularly useful for the preparation of polyolefin
with large alpha-olefin as well as high molecular weight and low
density polyolefin.
* * * * *